Entry 3 senses · 3 variants Webster, 1913 Imposthumate · Im·post·hu·mate · IPA v. t. v. t. a. 01 v. t. To apostemate; to form an imposthume or abscess. 1. To apostemate; to form an imposthume or abscess. 02 v. t. To affect with an imposthume or abscess. imp. & p. p. Imposthumated; p. pr. & vb. n. Imposthumating 1. To affect with an imposthume or abscess. 03 a. Imposthumated. 1. Imposthumated.