Synonyms for Crotchet (same or very similar meaning)
WordNet sense 1 (a sharp curve or crook; a shape resembling a hook):
hookWordNet sense 2 (a musical note having the time value of a quarter of a whole note):
quarter noteWordNet sense 3 (a strange attitude or habit):
oddity, queerness, quirk, quirkinessFrom the ODE community, based on WordNetadd/edit