Webster's English Dictionary

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diamond

1. di.a.mond \'di--(*-)m*nd\ n [ME diamaunde, fr. MF diamant, fr. LL 
   diamant-, diamas,] often attrib  alter. of L adamant-, adamas, hardest 
   metal, diamond, fr. Gk 1a: native crystalline carbon that is usu. nearly 
   colorless, that when tran sparent and free from flaws is highly valued as a 
   precious stone, and that is used industrially as an abrasive powder and in 
   rock drills because it is the hardest substance known; also : a piece of 
   this substance 1b: crystallized carbon produced artificially  2: something 
   that resembles a diamond  3: a square or rhombus-shaped configuration usu. 
   having a distinctive orien tation 4a: a red lozenge impressed on a playing 
   card; also : a card marked  with such lozenges pl but sing or pl in constr  
   4b: the suit comprising cards so marked  5a: INFIELD  5b: the entire 
   playing field in baseball or softball 
2. diamond vt : to adorn with or as if with diamonds