follow Dictionary.com

What's the "een" in Halloween?

lumen-hour

[loo-muh n-ouuh r, -ou-er] /ˈlu mənˌaʊər, -ˌaʊ ər/
noun, Optics.
1.
a unit of luminous energy, equal to that emitted in 1 hour by a light source emitting a luminous flux of 1 lumen.
Abbreviation: lm-hr.
Origin
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source

Word of the Day

Difficulty index for lumen-hour

Few English speakers likely know this word

Word Value for lumen

7
11
Scrabble Words With Friends