WordWeb Online

1. Very hard native crystalline carbon valued as a gem
   - adamant [archaic]
    
2. A transparent piece of diamond that has been cut and polished and is valued as a precious gem
    
3. A parallelogram with four equal sides; an oblique-angled equilateral parallelogram
   - rhombus, rhomb
    
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. (baseball) the area of a baseball field that is enclosed by 3 bases and home plate
   - baseball diamond, infield
    
6. The baseball playing field
   - ball field, baseball field

Derived forms: diamonds

Type of: athletic field, atomic number 6, C, carbon, field, gem, jewel, parallelogram, parcel, parcel of land, piece of ground, piece of land, pitch [Brit], playing area, playing card, playing field, precious stone, tract, transparent gem

Part of: ballpark [N. Amer], minor suit, park

Encyclopedia: Diamond, Milton