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n. A small beaklike part, such as a projection on the stigma of an orchid, a tubular mouthpart on some insects, or the hooked projection on the head of a tapeworm.

n. A small beak-like process or extension; a small rostrum.

n. A small beaklike process or extension of some part; a small rostrum

n. In botany: Any small beak-shaped process, as in the stigma of many violets; specifically, a modification of the stigma in many orchids, which bears the glands to which the pollen-masses are attached.

n. A Linnean term for the caulicle or radicle.

n. In zoology, the fore part of the head of tapeworms or other cestoids, bearing spines or hooklets which are said to be rostellar. See cut under Cestoidea.

n. [capitalized] [NL.] In conchology, same as Rostellaria.

n. The combined mouth-parts of the true lice, of the family Pediculidæ.

"The splitting of the rostellum, curiously enough, never happens without insect aid; but if a bristle or needle be passed over it ever so lightly, a stream of sticky, milky fluid exudes, hardens, and the boat-shaped disk, with pollen masses attached, may be withdrawn on the bristle just as the bee removes them with her tongue."