One of the mysteries of the English language finally explained.
1Any of various other coniferous trees; (in later use) specifically either of two silver firs of western North America, Abies magnifica and A. amabilis.
2The Douglas fir, Pseudotsuga menziesii. Also: the wood of this tree, especially when reddish in colour (as a result of growing conditions). Compare "yellow fir". Now rare.
Early 17th century (in an earlier sense). From red + fir.
red fir/ˌrɛd ˈfəː/
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