TUR'PENTINE-TREE, noun A tree of the genus Pistacia, which produces not only its proper fruit, but a kind of horn which grows on the surface of its leaves. This is found to be an excrescence, the effect of the puncture of an insect, and is produced in the same manner as the galls of other plants.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI