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lumen    音标拼音: [l'umən]
n. 流明,内腔

流明,内腔

lumen
流明

lumen
n 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 [synonym: {lumen}, {lm}]
2: a cavity or passage in a tubular organ; "the lumen of the
intestine"

Lumen \Lu"men\, n.; pl. L. {Lumina}, E. {Lumens}. [L., light, an
opening for light.]
1. (Photom.)
(a) A unit of illumination, being the amount of
illumination of a unit area of spherical surface, due
to a light of unit intensity placed at the center of
the sphere.
(b) A unit of light flux, being the flux through one
square meter of surface the illumination of which is
uniform and of unit brightness.
[Webster 1913 Suppl.]

2. (Biol.) An opening, space, or cavity, esp. a tubular
cavity; a vacuole.
[Webster 1913 Suppl.]


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