troffer

[ trof-er, traw-fer ]
/ ˈtrɒf ər, ˈtrɔ fər /

noun

a trough-shaped reflector holding one or more fluorescent lamps.

Origin of troffer

1940–45; troff (variant of trough) + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019