lumen

[ loo-muhn ]

Phonetic (Standard)IPA

noun

, plural lu·mens, lu·mi·na [loo, -m, uh, -n, uh].

Optics. the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity. : lm
Anatomy. the canal, duct, or cavity of a tubular organ.
Botany. (of a cell) the cavity that the cell walls enclose.

lumen

/ ˈluːmɪn /

the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela lm
anatomy a passage, duct, or cavity in a tubular organ
a cavity within a plant cell enclosed by the cell walls

lumen

/ lo̅o̅′mən /

, Plural lumens

The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine.
The SI derived unit used to measure the amount of light passing through a given area per second. One lumen is equal to the luminous flux passing per unit solid angle from a light source with a strength of one candela.

Origin of lumen¹

1870–75; < New Latin, special uses of Latin lūmen (stem lūmin- ) light, window

Origin of lumen¹

C19: New Latin, from Latin: light, aperture

That reminds me, I'd better arrange a debate on immigration for the Lumen.

"She made a splendid impression on the Lumen," Colburn went on.

In the second main variety of gland the secretory portion is enlarged and the lumen variously increased in size.

At about the time when a lumen appears in the Oviduct the first traces of the Wolffian duct become visible.

While undergoing this change of position it also acquires a lumen, but ends blindly both in front and behind.

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