silver maple

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

• noun An eastern North American deciduous tree (Acer saccharinum) having palmately dissected leaves that are silvery below and light green above.
• noun The hard brittle wood of this tree.

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

• noun a common North American maple tree; five-lobed leaves are light green above and silvery white beneath; source of hard close-grained but brittle light-brown wood