Definition of "diamond" []

  • An extremely hard, highly refractive crystalline form of carbon that is usually colorless and is used as a gemstone and in abrasives, cutting tools, and other applications. (noun)
  • A piece of jewelry containing such a gemstone. (noun)
  • A figure with four equal sides forming two inner obtuse angles and two inner acute angles; a rhombus or lozenge. (noun)
  • Games A red, lozenge-shaped figure on certain playing cards. (noun)
  • Games A playing card with this figure. (noun)
  • A colourless exceptionally hard mineral (but often tinted yellow, orange, blue, brown, or black by impurities), found in certain igneous rocks (esp the kimberlites of South Africa). It is used as a gemstone, as an abrasive, and on the working edges of cutting tools. Composition: carbon. Formula: C. Crystal structure: cubic (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • (as modifier) (noun)
  • A figure having four sides of equal length forming two acute angles and two obtuse angles; rhombus (noun)
  • Rhombic (noun)
  • A red lozenge-shaped symbol on a playing card (noun)
  • A card with one or more of these symbols or (when plural) the suit of cards so marked (noun)
  • The whole playing field (noun)
  • The square formed by the four bases (noun)
  • (formerly) a size of printer's type approximately equal to 41⁄2 point (noun)
  • To decorate with or as with diamonds (verb) (c) HarperCollins Publishers Ltd 2016

Use "diamond" in a sentence
  • "-- The real identity of the two words explains Milton’s use of ‘diamond’ in _Paradise Lost_, b. 7; and also in that sublime passage in his _Apology for Smectymnuus_: “Then zeal, whose substance is ethereal, arming in complete _diamond_”."
  • "I didn't know that the word diamond comes from the Greek word "Adamas" which means unconquerable."
  • "Dayzatari say that diamonds are the thoughts of stars, fallen to earth, and the Pelorian name for diamond translates as "starthought.""