vibratory

from WordNet (r) 3.0 (2006)

vibratory
    adj 1: moving very rapidly to and fro or up and down; "the
           vibrating piano strings"

from The Collaborative International Dictionary of English v.0.48

Vibratory \Vi"bra*to*ry\, a. [Cf. F. vibratoire.]
   Consisting in, or causing, vibration, or oscillation;
   vibrating; as, a vibratory motion; a vibratory power.
   [1913 Webster]