Definify.com
Webster 1913 Edition
Tentacle
Ten′ta-cle
,Noun.
(Zool.)
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.
Tentacle sheath
(Zool.)
, a sheathlike structure around the base of the tentacles of many mollusks.
Webster 1828 Edition
Tentacle
TEN'TACLE
,Noun.