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
Canada balsam in American English
a thick, yellow, resinous fluid from the balsam fir, used as a transparent cement in microscopy and in lacquers, flavorings, etc.