From WordNet (r) 2.0 (August 2003) [wn]:
Abies
n : true firs [syn: Abies, genus Abies]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Abies \A"bi*es\, n. [L., fir tree.] (Bot.)
A genus of coniferous trees, properly called Fir, as the
balsam fir and the silver fir. The spruces are sometimes also
referred to this genus.
[1913 Webster]