† aˈposteme, -ume,v.Obs.rare. [a. Fr.apostume-r (15th c. in Littré), f.apostume; see prec.] To form or break into an abscess. 1525Ld. Berners Froiss. II. cli. 417 He was in ieopardy of dethe, for his hed apostumed.1530Palsgr. 434/1, I apostume, as a sore dothe, Japostume.