Source : Webster's Revised Unabridged Dictionary (1913)

Vibratory \Vi"bra*to*ry\, a. [Cf. F. vibratoire.]
   Consisting in, or causing, vibration, or oscillation;
   vibrating; as, a vibratory motion; a vibratory power.

Source : WordNet®

vibratory
     adj : moving very rapidly to and fro or up and down; "the
           vibrating piano strings" [syn: {vibrating}]