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The Collaborative International Dictionary
Apostemation

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
apostemation

n. (context medicine English) The formation of an aposteme; the process of suppuration.