inborn : Idioms & Phrases
inborn error of metabolism
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noun any of a number of diseases in which an inherited defect (usually a missing or inadequate enzyme) results in an abnormality of metabolism
WordNet
inborn reflex
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noun an automatic instinctive unlearned reaction to a stimulus
innate reflex; reflex action; instinctive reflex; reflex response; unconditioned reflex; physiological reaction; reflex.