Source : Webster's Revised Unabridged Dictionary (1913)

Stifler \Sti"fler\, n.
   1. One who, or that which, stifles.

   2. (Mil.) See {Camouflet}.

Source : WordNet®

stifler
     n : a person who stifles or smothers or suppresses; "he is a
         real conversation stifler"; "I see from all the yawn
         smotherers that it is time to stop" [syn: {smotherer}]