rostellum, i, n. dim. [rostrum],
a little beak , snout , or muzzle : pullorum (avium), Col. 8, 5, 14: muris, Plin. 30, 11, 30, § 99.
·noun A small beaklike process or extension of some part; a small rostrum; as, the rostellum of the ...
Webster's Dictionary of the English Language