\\ˈträfə(r), ˈtrȯf-\ noun (-s)
Etymology: troff (alteration of trough) + -er
: an inverted trough serving as a support and reflector for a usually fluorescent lighting unit

* * *

/trof"euhr, traw"feuhr/, n.
a trough-shaped reflector holding one or more fluorescent lamps.
[1940-45; troff (var. of TROUGH) + -ER1]

Useful english dictionary. 2012.

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