The Collaborative International Dictionary of English v.0.48:

Oxime \Ox"ime\, n. (Chem.)
   One of a series of isonitroso derivatives obtained by the
   action of hydroxylamine on aldehydes or ketones.
   [1913 Webster]

WordNet (r) 3.0 (2006):

oxime
    n 1: any compound containing the group -C=NOH