Christmas tree

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:
1780–90, Americanism

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Collins
World English Dictionary
Christmas tree
 
n
1.  an evergreen tree or an imitation of one, decorated as part of Christmas celebrations
2.  (Austral) Also called: Christmas bush any of various trees or shrubs flowering at Christmas and used for decoration
3.  another name for pohutukawa

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

Christmas tree definition

hardware, jargon
A kind of EIA-232 line tester or breakout box featuring rows of blinking red and green LEDs suggestive of Christmas lights.
[Jargon File]
(2006-09-20)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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