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late 14c., from Medieval Latin suppositorium, noun use of neuter of Late Latin suppositorius "placed underneath or up," from Latin suppositus, past participle of supponere "put or place under" (see suppose).
suppository sup·pos·i·to·ry (sə-pŏz'ĭ-tôr'ē)
A small plug of medication designed to melt at body temperature within a body cavity other than the mouth, especially the rectum or vagina.