||Fla*gel"lum (?), n.; pl. E. Flagellums (#), L. Flagella (#). [L., a whip. See Flagellate, v. t.] 1. (Bot.) A young, flexible shoot of a plant; esp., the long trailing branch of a vine, or a slender branch in certain mosses.

2. (Zoöl.) (a) A long, whiplike cilium. See Flagellata. (b) An appendage of the reproductive apparatus of the snail. (c) A lashlike appendage of a crustacean, esp. the terminal ortion of the antennæ and the epipodite of the maxilipeds. See Maxilliped.