Lumen



GRE 蓝宝 Barron

解释

GRE 红宝书

• n.流明
• ［类］ decibel : sound / lumen : light ( 分贝是声音的单位 / 流明是光的单位)

Webster Collegiate

noun (plural lumens; also lumina)

• Etymology: New Latin lumin-, lumen, from Latin, light, air shaft, opening
• Date: 1873
• 1. the cavity of a tubular organ or part <the lumen of a blood vessel>
• 2. the bore of a tube (as of a hollow needle or catheter)
• 3. a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity
• ? luminal also lumenal adjective

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