Definition of flagellum

• v. t. - A young, flexible shoot of a plant; esp., the long trailing branch of a vine, or a slender branch in certain mosses.
• v. t. - A long, whiplike cilium. See Flagellata.
• v. t. - An appendage of the reproductive apparatus of the snail.
• v. t. - A lashlike appendage of a crustacean, esp. the terminal ortion of the antennae and the epipodite of the maxilipeds. See Maxilliped.