The Collaborative International Dictionary of English v.0.48:

Fir \Fir\ (f[~e]r), n. [Dan. fyr, fyrr; akin to Sw. furu, Icel.
   fura, AS. furh in furhwudu fir wood, G. f["o]hre, OHG. forha
   pine, vereheih a sort of oak, L. quercus oak.] (Bot.)
   A genus (Abies) of coniferous trees, often of large size
   and elegant shape, some of them valued for their timber and
   others for their resin. The species are distinguished as the
   balsam fir, the silver fir, the red fir, etc. The
   Scotch fir is a Pinus.
   [1913 Webster]

   Note: Fir in the Bible means any one of several coniferous
         trees, including, cedar, cypress, and probably three
         species of pine. --J. D. Hooker.
         [1913 Webster]