- another name for carbonado2
- (usually plural)
a figurative expression for coal
WordReference Random House Unabridged Dictionary of American English © 2026
black′ dia′mond,
- Mineralogycarbonado1.
- Mineralogy black diamonds, coal.
- 1910–15
Collins Concise English Dictionary © HarperCollins Publishers::
black diamond n
dia•mond /ˈdaɪmənd, ˈdaɪə-/USA pronunciation
n.
adj. [before a noun]
WordReference Random House Unabridged Dictionary of American English © 2026- 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.
- Sport[countable]
- the infield or the entire playing field in baseball.
adj. [before a noun]
- made of or set with diamonds:a diamond ring.
- having the shape of a diamond.
- indicating the 60th or 75th event of a series, such as a wedding anniversary.
- Idioms a diamond in the rough, [countable] a person or thing of great worth but unpolished or uncultivated.
dia•mond
(dī′mənd, dī′ə-),USA pronunciation n.
adj.
v.t.
dia′mond•like′, adj.
Dia•mond (dī′mənd, dī′ə-),USA pronunciation n.
- 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.
- Games diamonds, (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.
- the space enclosed by home plate and the three bases;
- Printinga 4½-point type of a size between brilliant and pearl.
- Idioms diamond 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 adamas adamant, diamond - Old French
- Middle English diamant 1275–1325
Dia•mond (dī′mənd, dī′ə-),USA pronunciation n.
- Biographical Neil, born 1941, U.S. singer and songwriter.
- Place Names Cape, a hill in Canada, in S Quebec, on the St. Lawrence River.
Collins Concise English Dictionary © HarperCollins Publishers::
diamond /ˈdaɪəmənd/ n
- 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
- the whole playing field
- the square formed by the four bases
- black diamond ⇒
a figurative name for coal
- (transitive) to decorate with or as with diamonds
'black diamond' also found in these entries (note: many are not synonyms or translations):