Mineralogy a stone of pure and extremely hard crystallized carbon that when cut and polished is transparent, bright, and valued as a precious gem:[countable]Coal and diamonds are both made of carbon.
Jewelry a piece of jewelry containing diamonds:[plural]She wore her diamonds.
Mathematics[countable] a four-sided figure with sides of equal length but with no right angles.
Games
[countable] a red figure shaped that way on a playing card.
[countable] a card bearing such figures:I had five diamonds.
diamonds, [uncountable* plural; used with a singular or plural verb] the suit of playing cards marked this way:Diamonds is the suit that is bid.
Mineralogya pure or nearly pure, extremely hard form of carbon, naturally crystallized in the isometric system.
a piece of this stone.
Jewelrya transparent, flawless or almost flawless piece of this stone, esp. when cut and polished, valued as a precious gem.
Jewelrya ring or other piece of jewelry containing such a precious stone, esp. 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.
Mineralogycrystallized carbon, or a piece of it, artificially produced.
Mathematicsan equilateral quadrilateral, esp. as placed with its diagonals vertical and horizontal; a lozenge or rhombus.
Mathematicsany rhombus-shaped figure or object oriented with its diagonals vertical and horizontal.
Gamesa red rhombus-shaped figure on a playing card.
Gamesa card of the suit bearing such figures.
Gamesdiamonds, (used with a sing. or pl. v.) the suit so marked:Diamonds is trump. Diamonds are trump.
Sport[Baseball.]
the space enclosed by home plate and the three bases; infield.
the entire playing field.
Printinga 4½-point type of a size between brilliant and pearl.
Idiomsdiamond in the rough, a person of fine character but lacking refined manners or graces.
adj.
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. See table under wedding anniversary.
v.t.
to adorn with or as if with diamonds.
Vulgar Latin *diamant-, stem of *diamas, perh. alteration of *adimas ( French aimant magnet, Old Provencal aziman diamond, magnet), for Latin adamasadamant, diamond
Old French
Middle English diamant 1275–1325
dia′mond•like′, adj.
Dia•mond(dī′mənd, dī′ə-),USA pronunciationn.
BiographicalNeil, born 1941, U.S. singer and songwriter.
Place NamesCape, a hill in Canada, in S Quebec, on the St. Lawrence River.
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
(as modifier): a diamond ring
a figure having four sides of equal length forming two acute angles and two obtuse angles; rhombus
a red lozenge-shaped symbol on a playing card
a card with one or more of these symbols or (when plural) the suit of cards so marked
Etymology: 13th Century: from Old French diamant, from Medieval Latin diamas, modification of Latin adamas the hardest iron or steel, diamond; see adamant
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