n. a slender evergreen, Abies balsamea, found in Canada from northeastern Alberta eastward, the source of Canada balsam (def. 1); also the wood of this tree.
1807  The habitations of these people are built in oblong figure, of pieces of wood placed upon one another, the roof of which is thatched with sapin and the sides cemented or rather calked with moss.
1846  (1955)  The Indians trampled down the snow for a resting-place, made a seat of sapins--the tops of fir trees, and brought us deliciously cold and pure water from a stream close by. . . .
1931  Down the course marked out by "sapins" and back again amid the cheering throngs, the procession moved at a moderate pace.