yard-long bean

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

• noun A type of cowpea (Vigna unguiculata subsp. sesquipedalis) native to southern Asia, having drooping pods that can grow up to a yard long and are eaten as a vegetable.

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

• noun South American bean having very long succulent pods