Source : Webster's Revised Unabridged Dictionary (1913)

Clavier \Cla"vi*er\ (? F. ?), n. [F., fr. L. clavis key.] (Mus.)
   The keyboard of an organ, pianoforte, or harmonium.

   Note: Clavier (?) is the German name for a pianoforte.

Source : WordNet®

clavier
     n 1: a bank of keys on a musical instrument [syn: {piano keyboard},
           {fingerboard}]
     2: a stringed instrument that has a keyboard [syn: {Klavier}]