The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

Abies
    n 1: true firs [syn: Abies, genus Abies]