Source : Webster's Revised Unabridged Dictionary (1913)

Imposthume \Im*post"hume\, v. t. & i.
   Same as {Imposthumate}.

Imposthume \Im*post"hume\, n. [A corruption of aposteme. See
   {Aposteme}.]
   A collection of pus or purulent matter in any part of an
   animal body; an abscess.