reaction : Idioms & Phrases

• noun a chemical reaction in which one molecule is added to another
  

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• noun a reaction of aldehydes resulting in an aldol
  

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• a reaction indicating alkalinity, as by the action on limits, turmeric, etc.

Webster 1913

• noun hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
  allergy.
  

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• noun renewed rapid production of an antibody on the second (or subsequent) encounter with the same antigen
  anamnestic response.
  

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• noun an anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six months
  generalized anxiety disorder; GAD.
  

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• (Chem.), the characteristic behavior of a substance subjected to a test by means of the blowpipe.

Webster 1913

• noun a radical terrorist group dedicated to the removal of British forces from Northern Ireland and the unification of Ireland
  Irish National Liberation Army; People's Liberation Army; INLA; People's Republican Army.
  

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• noun a series of chemical reactions in which the product of one is a reactant in the next
  
• noun a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
  

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• noun (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
  chemical decomposition reaction; decomposition.
  

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• noun (chemistry) a process in which one or more substances are changed into others
  reaction.
  
  • there was a chemical reaction of the lime with the ground water

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• noun an acquired response that is under the control of (conditional on the occurrence of) a stimulus
  acquired reflex; conditional response; conditional reaction; conditioned reflex; conditioned response; conditional reflex.
  

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• noun an acquired response that is under the control of (conditional on the occurrence of) a stimulus
  acquired reflex; conditional response; conditional reaction; conditioned reflex; conditioned response; conditional reflex.
  

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• noun a mental disorder characterized by the conversion of mental conflict into somatic forms (into paralysis or anesthesia having no apparent cause)
  conversion disorder; conversion hysteria.
  

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• noun (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
  chemical decomposition reaction; decomposition.
  

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• noun (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
  defence; defence mechanism; defense; defense mechanism; defence reaction.
  

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• noun (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
  defence; defence mechanism; defense; defense mechanism; defence reaction.
  

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• (Chem.), a series of reactions whereby diazo compounds are employed in substitution. These reactions are of great importance in organic chemistry.

Webster 1913

• noun (chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
  displacement.
  

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• noun a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
  double decomposition; metathesis.
  

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• noun a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
  

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• noun a chemical reaction in which a molecule decomposes to two different molecules
  

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• noun a nuclear reaction occurring with absorption of energy
  

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• noun a chemical reaction accompanied by the absorption of heat
  

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• noun a nuclear reaction accompanied by the evolution of energy
  

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• noun a chemical reaction accompanied by the evolution of heat
  

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• (Chem.), a method of testing for the presence of certain elements by the characteristic color imparted to a flame; as, sodium colors a flame yellow, potassium violet, lithium crimson, boracic acid green, etc. Cf. Spectrum analysis, under Spectrum.

Webster 1913

• noun an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
  

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• noun a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen
  immune response; immunologic response.
  

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• noun hypoglycemia produced by excessive insulin in the system causing coma
  insulin shock.
  

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• noun action and reaction are equal and opposite
  third law of motion; Newton's third law of motion; Newton's third law.
  

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• noun a reaction that has been acquired by learning
  learned response.
  

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• noun the first stage of photosynthesis during which energy from light is used for the production of ATP
  

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• noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha-naphthol in the presence of sulfuric acid
  Molisch's test; alpha-naphthol test; Molisch test.
  

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• noun a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
  neutralization; neutralisation; neutralisation reaction.
  

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• noun a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
  neutralization; neutralisation; neutralisation reaction.
  

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• noun a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
  fusion; nuclear fusion.
  

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• noun (physics) a process that alters the energy or structure or composition of atomic nuclei
  

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• noun a chemical reaction produced by the action of light
  

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• noun an automatic instinctive unlearned reaction to a stimulus
  inborn reflex; innate reflex; reflex action; instinctive reflex; reflex response; unconditioned reflex; reflex.
  

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• noun the swelling of the capsule surrounding a microorganism after reaction with an antibody; the basis of certain tests for identifying microorganisms
  quellung.
  
  • pneumococcus quellung

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• noun a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
  reaction engine.
  

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• noun (psychiatry) a defense mechanism in which a person unconsciously develops attitudes and behavior that are the opposite of unacceptable repressed desires and impulses and serve to conceal them
  
  • his strict morality is just a reaction formation to hide his sexual drive

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• noun propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
  

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• noun the time that elapses between a stimulus and the response to it
  latency; latent period; response time.
  

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• (Physiol.), in nerve physiology, the interval between the application of a stimulus to an end organ of sense and the reaction or resulting movement; called also physiological time.

Webster 1913

• noun a turbine with blades arranged to develop torque from gradual decrease of steam pressure from inlet to exhaust
  

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• (Mech.), a water wheel driven by the reaction of water, usually one in which the water, entering it centrally, escapes at its periphery in a direction opposed to that of its motion by orifices at right angles, or inclined, to its radii.

Webster 1913

• noun a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
  reaction engine.
  

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• noun a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions
  startle response.
  

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• noun a nuclear fusion reaction taking place at very high temperatures (as in the sun)
  

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• noun reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death
  

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• noun an allergic reaction that becomes apparent in a sensitized person only minutes after contact
  immediate allergy; atopic allergy; atopy.
  

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• noun an allergic reaction that becomes apparent only hours after contact
  delayed allergy.
  

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• noun a blood test to detect syphilis; a complement fixation test is used to detect antibodies to the syphilis organism treponema; a positive reaction indicates the presence of antibodies and therefore syphilis infection
  Wassermann; Wassermann test.
  

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