- any marine crustacean of the subclass Cirripedia, usually having a calcareous shell, being either stalked (goose barnacle ) and attaching itself to ship bottoms and floating timber, or stalkless (rock barnacle, or acorn barnacle ) and attaching itself to rocks, especially in the intertidal zone.
- a person or thing that clings tenaciously.
- an instrument with two hinged branches for pinching the nose of an unruly horse.
- spectacles (def. 3).
- any of various marine crustaceans of the subclass Cirripedia that, as adults, live attached to rocks, ship bottoms, etc. They have feathery food-catching cirri protruding from a hard shell
- a person or thing that is difficult to get rid of
