名詞 lumen:

1. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
   同義詞：lm
2. a cavity or passage in a tubular organ

lu.men

n.（名詞）
【復(fù)數(shù)】 lu.mens 或 lu.mi.na [-m…-n…]
Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
【解剖學(xué)】 腔：管狀器官的內(nèi)部腔室或腔，窩，比如在血管或腸中的腔
Abbr. lmPhysics The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.See table at measurement
縮寫 lm【物理學(xué)】 流明（光通量單位）：國際度量系統(tǒng)中的光通量單位，等于一燭光的均勻點(diǎn)光源在單位主體角內(nèi)發(fā)出的光通量參見 measurement
Botany The cavity bounded by a plant cell wall.
【植物學(xué)】 （管）腔：細(xì)胞壁周圍的空間

來源：
Latin [an opening, light] * see leuk-
拉丁語 [開口，光] *參見 leuk-

【引伸】
lu.menal 或
lu.minal
adj.（形容詞）