'Christmas tree' definitions:

Definition of 'Christmas tree'

(from WordNet)
noun
Australian tree or shrub with red flowers; often used in Christmas decoration [syn: Christmas bush, Christmas tree, Ceratopetalum gummiferum]
noun
A terrestrial evergreen shrub or small tree of western Australia having brilliant yellow-orange flowers; parasitic on roots of grasses [syn: flame tree, fire tree, Christmas tree, Nuytsia floribunda]
noun
Tall timber tree of central and southern Europe having a regular crown and grey bark [syn: European silver fir, Christmas tree, Abies alba]
noun
Medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed [syn: amabilis fir, white fir, Pacific silver fir, red silver fir, Christmas tree, Abies amabilis]
noun
An ornamented evergreen used as a Christmas decoration

Definition of 'Christmas tree'

From: GCIDE
  • Christmas \Christ"mas\, n. [Christ + mass.] An annual church festival (December 25) and in some States a legal holiday, in memory of the birth of Christ, often celebrated by a particular church service, and also by special gifts, greetings, and hospitality. [1913 Webster]
  • Christmas box. (a) A box in which presents are deposited at Christmas. (b) A present or small gratuity given to young people and servants at Christmas; a Christmas gift.
  • Christmas carol, a carol sung at, or suitable for, Christmas.
  • Christmas day. Same as Christmas.
  • Christmas eve, the evening before Christmas.
  • Christmas fern (Bot.), an evergreen North American fern (Aspidium acrostichoides), which is much used for decoration in winter.
  • Christmas flower, Christmas rose, the black hellebore, a poisonous plant of the buttercup family, which in Southern Europe often produces beautiful roselike flowers midwinter.
  • Christmas tree, a small evergreen tree, set up indoors, to be decorated with bonbons, presents, etc., and illuminated on Christmas eve. [1913 Webster]