Source : Webster's Revised Unabridged Dictionary (1913)

Vibrate \Vi"brate\, v. t. [imp. & p. p. {Vibrate}; p. pr. & vb.
   n. {Vibrating}.] [L. vibratus, p. p. of vibrare, v. t. & v.
   i., to snake, brandish, vibrate; akin to Skr. vip to tremble,
   Icel. veifa to wave, vibrate. See {Waive} and cf. {Whip}, v.
   t.]
   1. To brandish; to move to and fro; to swing; as, to vibrate
      a sword or a staff.

   2. To mark or measure by moving to and fro; as, a pendulum
      vibrating seconds.

   3. To affect with vibratory motion; to set in vibration.

            Breath vocalized, that is, vibrated or undulated,
            may . . . impress a swift, tremulous motion.
                                                  --Holder.

            Star to star vibrates light.          --Tennyson.

Source : WordNet®

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