اسم ( noun )
حالات: lumens, lumina
• (1) تعریف: 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)
• (2) تعریف: a hollow space, as in the bore of a hollow needle or in a bodily duct or tract.