Christmas tree (Noun) — Australian tree or shrub with red flowers; often used in Christmas decoration.
Christmas tree (Noun) — A terrestrial evergreen shrub or small tree of western Australia having brilliant yellow-orange flowers; parasitic on roots of grasses.
Christmas tree (Noun) — An ornamented evergreen used as a Christmas decoration.
Christmas tree (Noun) — Tall timber tree of central and southern Europe having a regular crown and grey bark.
Christmas tree (Noun) — Medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed.