box elder

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

• noun A small to medium-sized maple tree (Acer negundo) native to North America, having pinnately compound leaves with three to seven leaflets.

from The Century Dictionary.

• noun See elder and Negundo.

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

• noun common shade tree of eastern and central United States