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lu·men
 lumen
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- pronunciation:
- lu
m
 n
- features:
- Word Combinations (noun), Word Parts
| part of speech: |
noun |
| inflections: |
lumens, lumina |
| definition 1: |
a unit of measure of the flow of light, equal to the flow from a light source of one-candle strength, measured on a unit surface at a unit distance. (abbr.: lm)
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| definition 2: |
a hollow space, as in the bore of a hollow needle or in a bodily duct or tract.
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