n. In zoology, some or any elongated and comparatively slender or flexible process or appendage of an animal, used as an organ of touch, or for exploration, prehension, and sometimes locomotion; a feeler; a tentaculum.n. In botany, a kind of sensitive hair or filament, such as the glandular hairs of Drosera.n. Figuratively, anything resembling a tentacle; a feeler.n. See the adjectives.