Dictionary
al'der fly'catcher
a North American flycatcher,
Empidonax alnorum, of alder thickets and other moist areas, that has greenish-brown upper parts and whitish underparts and is almost indistinguishable except by voice from
E. traillii (willow flycatcher). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.