goose barnacle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various barnacles having a fleshy stalk that attaches to rocks or floating objects such as ships' hulls.

from The Century Dictionary.

• noun A stalked barnacle, as Lepas anatifera: in allusion to the fable that it gave origin to geese. See barnacle, 2.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun stalked barnacle that attaches to ship bottoms or floating timbers