The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
demisemiquaver n 1: a musical note having the time value of a thirty-second of a whole note [syn: thirty-second note, demisemiquaver]