balsam fir

a North American fir, Abies balsamea, having dark purplish cones and yielding Canada balsam.
the wood of this tree.
any of certain other firs.

1795–1805, Americanism Unabridged

balsam of fir

Canada balsam

a pale yellow or greenish, slightly fluorescent, clear, viscous, bitter-tasting, water-insoluble liquid, having a pleasant, aromatic, pinelike odor, and solidifying on exposure to air: obtained from the balsam fir, Abies balsamea, and used chiefly for mounting objects on microscope slides, in the manufacture of fine lacquers, and as a cement for lenses.
Also called Canada turpentine, balsam of fir.

1810–20, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
balsam fir
See also balm of Gilead balsam, Also called: Canada balsam. a fir tree, Abies balsamea, of NE North America, that yields Canada balsam

Canada balsam
1.  a yellow transparent resin obtained from the balsam fir. Because its refractive index is similar to that of glass, it is used as an adhesive in optical devices and as a mounting medium for microscope specimens
2.  another name for balsam fir

Collins English Dictionary - Complete & Unabridged 10th Edition
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