box elder

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A North American maple tree (Acer negundo) having pinnately compound leaves with coarsely toothed to lobed leaflets. Also called ash-leaved maple.

Century Dictionary and Cyclopedia

1. n. See elder and Negundo.

GNU Webster's 1913

1. n. the ash-leaved maple (Negundo aceroides), of North America.
2. n. See under 1st Box.

WordNet 3.0

1. n. common shade tree of eastern and central United States