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The Collaborative International Dictionary of English v.0.48:

Rostellum \Ros*tel"lum\, 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]