‖Thu″ja (thū″jȧ), n. [NL., from Gr. θυία an African tree with sweet-smelling wood.] (Bot.) A genus of evergreen trees, thickly branched, remarkable for the distichous arrangement of their branches, and having scalelike, closely imbricated, or compressed leaves. [Written also thuya.] See Thyine wood.
☞ Thuja occidentalis is the Arbor vitæ of the Eastern and Northern United States. T. gigantea of North-western America is a very large tree, there called red cedar, and canoe cedar, and furnishes a useful timber.