Source : Webster's Revised Unabridged Dictionary (1913)

Suppository \Sup*pos"i*to*ry\, n.; pl. {Suppositories}. [LL.
   suppositorium, fr. L. suppositorius that is placed
   underneath: cf. F. suppositoire. See {Supposition}.] (Med.)
   A pill or bolus for introduction into the rectum; esp., a
   cylinder or cone of medicated cacao butter.

Source : WordNet®

suppository
     n : a small plug of medication designed for insertion into the
         rectum or vagina where it melts