diamond Meaning, Definition & Usage

  1. noun a transparent piece of diamond that has been cut and polished and is valued as a precious gem
  2. noun very hard native crystalline carbon valued as a gem
    adamant.
  3. noun a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
    rhomb; rhombus.
  4. noun a playing card in the minor suit that has one or more red rhombuses on it
    • he led a small diamond
    • diamonds were trumps
  5. noun the area of a baseball field that is enclosed by 3 bases and home plate
    baseball diamond; infield.
  6. noun the baseball playing field
    ball field; baseball field.

WordNet

Di"a*mond noun
Etymology
OE. diamaund, diamaunt, F. diamant, corrupted, fr. L. adamas, the hardest iron, steel, diamond, Gr. . Perh. the corruption is due to the influence of Gr. transparent. See Adamant, Tame.
Definitions
  1. A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness. ✍ The diamond is native carbon in isometric crystals, often octahedrons with rounded edges. It is usually colorless, but some are yellow, green, blue, and even black. It is the hardest substance known. The diamond as found in nature (called a rough diamond) is cut, for use in jewelry, into various forms with many reflecting faces, or facets, by which its brilliancy is much increased. See Brilliant, Rose. Diamonds are said to be of the first water when very transparent, and of the second or third water as the transparency decreases.
  2. A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.
  3. One of a suit of playing cards, stamped with the figure of a diamond.
  4. (Arch.) A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.
  5. (Baseball) The infield; the square space, 90 feet on a side, having the bases at its angles.
  6. (Print.) The smallest kind of type in English printing, except that called brilliant, which is seldom seen. * This line is printed in the type called Diamond.
Di"a*mond adjective
Definitions
  1. Resembling a diamond; made of, or abounding in, diamonds; as, a diamond chain; a diamond field.

Webster 1913