'Tentacle' definitions:

Definition of 'tentacle'

From: WordNet
noun
Something that acts like a tentacle in its ability to grasp and hold; "caught in the tentacles of organized crime"
noun
Any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals; used for feeling or grasping or locomotion

Definition of 'Tentacle'

From: GCIDE
  • Tentacle \Ten"ta*cle\, n. [NL. tentaculum, from L. tentare to handle, feel: cf. F. tentacule. See Tempt.] (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. [1913 Webster]
  • Tentacle sheath (Zool.), a sheathlike structure around the base of the tentacles of many mollusks. [1913 Webster]