diamond meaning and definition

DIAMOND noun

Definition of diamond (noun)

1. a transparent piece of diamond that has been cut and polished and is valued as a precious gem
2. very hard native crystalline carbon valued as a gem
   • synonyms: adamant
3. a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
   • synonyms: rhomb, rhombus
4. a playing card in the minor suit that has one or more red rhombuses on it
   • "he led a small diamond"; "diamonds were trumps"
5. the area of a baseball field that is enclosed by 3 bases and home plate
   • synonyms: baseball diamond, infield
   • antonym: outfield
6. the baseball playing field
   • synonyms: ball field, baseball field