n.1 a long slender flexible appendage of an (esp. invertebrate) animal, used for feeling, grasping, or moving.
2 a thing used like a tentacle as a feeler etc.
3 Bot. a sensitive hair or filament.
Derivatives:
tentacled adj. (also in comb.). tentacular adj. tentaculate adj.
Etymology: mod.L tentaculum f. L tentare temptare (see TEMPT) + -culum -CULE