(Science: zoology) A more or less elongated process or organ, simple or branched, proceeding from the head or cephalic region of invertebrate animals, being either an organ of sense, prehension, or motion.
(Science: zoology) Tentacle sheath, a sheathlike structure around the base of the tentacles of many mollusks.
Origin: NL. Tentaculum, from L. Tentare to handle, feel: cf. F. Tentacule. See Tempt.