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Webster 1913 Edition
Aposteme
Ap′os-teme
,Noun.
 [L. 
apostema
, Gr. [GREEK] the separation of corrupt matter into an ulcer, fr. [GREEK] to stand off: cf. F. apostème
. See Apostasy
.] (Med.) 
An abscess; a swelling filled with purulent matter. 
[Written corruptly 
imposthume
.] Webster 1828 Edition
Aposteme
AP'OSTEME
,Noun.
  An abscess; a swelling filled with purulent matter; written also corruptly imposthume.