Canada balsam (noun)
1: yellow transparent exudate of the balsam fir; used as a transparent cement in optical devices (especially in microscopy) and as a mounting medium [syn: [[Canada balsam]]]
2: medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees [syn: balsam fir, balm of Gilead, [[Canada balsam]], Abies balsamea]