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