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diamond

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A diamond is defined as a colorless, very hard, crystalline mineral made of pure carbon, or a figure with four equal sides with small angles on the top and bottom and wider angles on the sides.

(noun)

An example of a diamond is a traditional stone in an engagement ring.
An example of a diamond is the baseball playing field, specifically where each of the four bases are placed.
An example of a diamond is the suit of playing cards with a red, squarish symbol.

The definition of diamond is set with a diamond, or marking a 60th or 75th year.

(adjective)

An example of diamond used as an adjective is diamond earrings.
An example of something diamond is a couple's 60th wedding anniversary.

Diamond means to adorn with this mineral.

(verb)

An example of diamond is to wear a lot of diamonds in rings, earrings and necklaces.

See diamond in Webster's New World College Dictionary

noun

a usually colorless, crystalline mineral consisting of pure carbon, with nearly perfect cleavage and the greatest hardness of any substance: unflawed, transparent stones are cut into gems of great brilliance, and less perfect forms are used for cutting tools, abrasives, etc.
a gem or other piece cut from this mineral
1. a lozenge-shaped plane figure (♦)
2. any of a suit of playing cards marked with such figures in red
3. this suit of cards
☆ Baseball
1. the infield
2. the whole playing field

Origin: ME diamaunt < OFr diamant < ML diamas (gen. diamantis), for L adamas < Gr, adamant, diamond

adjective

of, like, or set with a diamond or diamonds
marking or celebrating the 60th, or sometimes 75th, year: a diamond jubilee

transitive verb

to adorn with or as with diamonds

See diamond in American Heritage Dictionary 4

noun

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.
A piece of jewelry containing such a gemstone.
A figure with four equal sides forming two inner obtuse angles and two inner acute angles; a rhombus or lozenge.
Games
a. A red, lozenge-shaped figure on certain playing cards.
b. A playing card with this figure.
c. diamonds (used with a sing. or pl. verb) The suit of cards represented by this figure.
Baseball
a. An infield.
b. The whole playing field.