Christmas tree

noun
  1. an evergreen tree decorated at Christmas with ornaments and lights.
  2. a control board or panel containing a variety of colored lights for indicating the status of various functions, elements, components, etc.
  3. an elaborate arrangement of pipes, valves, etc., as for controlling the flow of oil or gas.

Origin of Christmas tree

An Americanism dating back to 1780–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for christmas tree

Christmas tree

noun
  1. an evergreen tree or an imitation of one, decorated as part of Christmas celebrations
  2. Also called: Christmas bush Australian any of various trees or shrubs flowering at Christmas and used for decoration
  3. another name for pohutukawa
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012