Canada balsam
noun
Can·a·da balsam ˈka-nə-də- 
: a viscid yellowish to greenish oleoresin exudate of the balsam fir (Abies balsamea) that solidifies to a transparent mass and is used as a transparent cement especially in microscopy
Word History
Etymology
Canada, country in North America
First Known Use
1754, in the meaning defined above
Medical Definition
Canada balsam
noun
ˌkan-əd-ə-
: an oleoresin exuded by the balsam fir and used as a transparent cement especially in microscopy for mounting specimens and in optical instruments
called also Canada turpentine