lumen

剑桥词典

lumen noun [C] (UNIT OF LIGHT)

physics   (abbreviation lm)
a unit for measuring the amount of light something produces
（光的单位）流明
a light bulb rated at 750 lumens 一只750流明的电灯泡

lumen noun [C] (IN BODY)

medical   plural luminalumens
the inside space of a tube-shaped organ in the body , for example a blood vessel or intestine
（身体内的）腔
intestinal /vascular lumen 肠道／血管管腔 返回 lumen