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
3. a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
4. a playing card in the minor suit that has one or more red rhombuses on it"he led a small diamond"
5. the area of a baseball field that is enclosed by 3 bases and home plate
6. the baseball playing field