christmas_tree has definitions from the fields of botany,biology
1
[ noun ] (botany) medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed

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silver_fir

2
[ noun ] (botany) tall timber tree of central and southern Europe having a regular crown and gray bark

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silver_fir

3
[ noun ] (biology,botany) a terrestrial evergreen shrub or small tree of western Australia having brilliant yellow-orange flowers; parasitic on roots of grasses

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parasitic_plant Nuytsia

4
[ noun ] (botany) Australian tree or shrub with red flowers; often used in Christmas decoration

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tree Ceratopetalum

5
[ noun ] an ornamented evergreen used as a Christmas decoration

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decoration

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