Source : Webster's Revised Unabridged Dictionary (1913)

Demisemiquaver \Dem`i*sem"i*qua`ver\, n. (Mus.)
   A short note, equal in time to the half of a semiquaver, or
   the thirty-second part of a whole note.

Source : WordNet®

demisemiquaver
     n : a musical note having the time value of a thirty-second of a
         whole note [syn: {thirty-second note}]