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The Collaborative International Dictionary
red fir

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.

Wiktionary
red fir

n. (taxlink Abies magnifica species noshow=1), a western North American fir tree.