Source : Webster's Revised Unabridged Dictionary (1913)

Greave \Greave\, n.
   A grove. [Obs.] --Spenser.

Greave \Greave\, n. [OF. grees; cf. Sp. grevas.]
   Armor for the leg below the knee; -- usually in the plural.

Greave \Greave\, v. t. [imp. & p. p. {Greaved} (gr[=e]vd); p.
   pr. & vb. n. {Greaving}.] [From {Greaves}.] (Naut.)
   To clean (a ship's bottom); to grave.

Source : WordNet®

greave
     n : armor plate that protects legs below the knee [syn: {greaves},
          {jambeau}]