Christmas tree

an evergreen tree decorated at Christmas with ornaments and lights.

a control board or panel containing a variety of colored lights for indicating the status of various functions, elements, components, etc.

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

Mohamed Mohamud tried to blow up a Portland Christmas-tree lighting in 2010.

Mohamed Mohamud Trial: Was He Tricked Into Terrorism? |Winston Ross |April 23, 2012 |DAILY BEAST
He look 'way up high on Christmas-tree, then he leave his conscious in kindergarten room.

Mr. Bamboo and the Honorable Little God |Fannie C. Macaulay
If we could not give them the longed-for home Christmas, we could at least give them a Christmas-tree.

A Versailles Christmas-Tide |Mary Stuart Boyd
I am helping her gild fir-cones for a Christmas-tree for the quire, and they will sing carols.

Beechcroft at Rockstone |Charlotte M. Yonge

A Upas tree and a Christmas-tree could hardly find place in the same home.

The Upas Tree |Florence L. Barclay
We paid a hundred dollars for rent and twenty-five dollars for a Christmas-tree.

A Backward Glance at Eighty |Charles A. Murdock

Christmas tree

an evergreen tree or an imitation of one, decorated as part of Christmas celebrations

Also called: Christmas bush Australian any of various trees or shrubs flowering at Christmas and used for decoration

another name for pohutukawa