GNU Collaborative International Dictionary of English

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1.       
   ‖Rostellum , n.; pl. Rostella . [L. See Rostel.] A small beaklike process or extension of some part; a small rostrum; as, the rostellum of the stigma of violets, or of the operculum of many mosses; the rostellum on the head of a tapeworm.
   1913 Webster