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[dahy-muh nd, dahy-uh-] /ˈdaɪ mənd, ˈdaɪ ə-/
a pure or nearly pure, extremely hard form of carbon, naturally crystallized in the isometric system.
a piece of this stone.
a transparent, flawless or almost flawless piece of this stone, especially when cut and polished, valued as a precious gem.
a ring or other piece of jewelry containing such a precious stone, especially an engagement ring.
a piece of this stone used in a drill or cutting tool.
a tool provided with such an uncut stone, used for cutting glass.
crystallized carbon, or a piece of it, artificially produced.
an equilateral quadrilateral, especially as placed with its diagonals vertical and horizontal; a lozenge or rhombus.
any rhombus-shaped figure or object oriented with its diagonals vertical and horizontal.
a red rhombus-shaped figure on a playing card.
a card of the suit bearing such figures.
diamonds, (used with a singular or plural verb) the suit so marked:
Diamonds is trump. Diamonds are trump.
  1. the space enclosed by home plate and the three bases; infield.
  2. the entire playing field.
Printing. a 4½-point type of a size between brilliant and pearl.
made of or set with a diamond or diamonds.
having the shape of a diamond:
a dress with a diamond print.
indicating the 75th, or sometimes the 60th, event of a series, as a wedding anniversary.
verb (used with object)
to adorn with or as if with diamonds.
diamond in the rough, a person of fine character but lacking refined manners or graces.
Origin of diamond
1275-1325; Middle English diamant < Old French < Vulgar Latin *diamant-, stem of *diamas, perhaps alteration of *adimas (> French aimant magnet, Old Provençal aziman diamond, magnet), for Latin adamas adamant, diamond
Related forms
diamondlike, adjective


[dahy-muh nd, dahy-uh-] /ˈdaɪ mənd, ˈdaɪ ə-/
Neil, born 1941, U.S. singer and songwriter.
Cape, a hill in Canada, in S Quebec, on the St. Lawrence River. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for diamond
Contemporary Examples
Historical Examples
  • But you never need be such a fool as to expect that anybody will find out you're a diamond till you get a showy setting!

  • Ostensibly they were a literary society; really they were diamond polishers.

    Ester Ried Yet Speaking Isabella Alden
  • As she spoke she unconsciously laid her hand upon the diamond crescent at her breast.

    Sir Christopher Maud Wilder Goodwin
  • Mr. Hartgold took up a diamond with a pair of pincers, and exhibited it to the banker.

    Henry Dunbar M. E. Braddon
  • You puff and blow like a seal when you come upstairs; your paunch rises and falls like a diamond on a woman's forehead!

    Melmoth Reconciled Honore de Balzac
British Dictionary definitions for diamond


  1. 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
  2. (as modifier): a diamond ring, related adjective diamantine
  1. a figure having four sides of equal length forming two acute angles and two obtuse angles; rhombus
  2. (modifier) rhombic
  1. a red lozenge-shaped symbol on a playing card
  2. a card with one or more of these symbols or (when plural) the suit of cards so marked
  1. the whole playing field
  2. the square formed by the four bases
(formerly) a size of printer's type approximately equal to 41/2 point
black diamond, a figurative name for coal
rough diamond
  1. an unpolished diamond
  2. a person of fine character who lacks refinement and polish
(transitive) to decorate with or as with diamonds
Derived Forms
diamond-like, adjective
Word Origin
C13: from Old French diamant, from Medieval Latin diamas, modification of Latin adamas the hardest iron or steel, diamond; see adamant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diamond

early 14c., from Old French diamant, from Medieval Latin diamantem (nominative diamas), from Vulgar Latin *adiamantem (altered by influence of the many Greek words in dia-), from Latin adamantem (nominative adamans) "the hardest metal," later, "diamond" (see adamant). Playing card suit is from 1590s; Sense in baseball is American English, 1875.

Online Etymology Dictionary, © 2010 Douglas Harper
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diamond in Science
A form of pure carbon that occurs naturally as a clear, cubic crystal and is the hardest of all known minerals. It often occurs as octahedrons with rounded edges and curved surfaces. Diamond forms under conditions of extreme temperature and pressure and is most commonly found in volcanic breccias and in alluvial deposits. Poorly formed diamonds are used in abrasives and in industrial cutting tools.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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diamond in Technology

One of five pedagogical languages based on Markov algorithms, used in "Nonpareil, a Machine Level Machine Independent Language for the Study of Semantics", B. Higman, ULICS Intl Report No ICSI 170, U London (1968). (cf. Brilliant, Nonpareil, Pearl[3], Ruby[2]).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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diamond in the Bible

(1.) A precious gem (Heb. yahalom', in allusion to its hardness), otherwise unknown, the sixth, i.e., the third in the second row, in the breastplate of the high priest, with the name of Naphtali engraven on it (Ex. 28:18; 39:11; R.V. marg., "sardonyx.") (2.) A precious stone (Heb. shamir', a sharp point) mentioned in Jer. 17:1. From its hardness it was used for cutting and perforating other minerals. It is rendered "adamant" (q.v.) in Ezek. 3:9, Zech. 7:12. It is the hardest and most valuable of precious stones.

Easton's 1897 Bible Dictionary
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