World English Dictionary
diamond (ˈdaɪəmənd)
1.  a.  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
 b.  (as modifier): a diamond ring Related: diamantine
2.  geometry
 a.  a figure having four sides of equal length forming two acute angles and two obtuse angles; rhombus
 b.  (modifier) rhombic
3.  a.  a red lozenge-shaped symbol on a playing card
 b.  a card with one or more of these symbols or (when plural) the suit of cards so marked
4.  baseball
 a.  the whole playing field
 b.  the square formed by the four bases
5.  (formerly) a size of printer's type approximately equal to 4½ point
6.  black diamond a figurative name for coal
7.  rough diamond
 a.  an unpolished diamond
 b.  a person of fine character who lacks refinement and polish
8.  (tr) to decorate with or as with diamonds
Related: diamantine
[C13: from Old French diamant, from Medieval Latin diamas, modification of Latin adamas the hardest iron or steel, diamond; see adamant]

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