n. 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 or motion
Even as he swam, the tentacle was lazily withdrawn, so that there was no sign of the creature.
It has eight lashing arms and two slashing tentacles growing straight out of its head and it's got serrated suckers that can latch on to the slimiest of prey and it's got a parrot beak that can rip flesh.
Sentence in Classic:
Having once got its tentacles fastened on to the economic and social life of the Republic, it was no easy matter for the country to relieve itself of the institution.
Up From Slavery: An Autobiography By Booker T. Washington Context