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The Collaborative International Dictionary
imposthumation

Apostemation \A*pos`te*ma"tion\, n. [LL. apostematio: cf. F. apost['e]mation.] (Med.) The formation of an aposteme; the process of suppuration. [Written corruptly imposthumation.]
--Wiseman.

Wiktionary
imposthumation

n. 1 The formation of an abscess; inflammation; suppuration 2 An abscess; an imposthume.