Hypertext Webster Gateway: "lumen"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
2. (Biol.) An opening, space, or cavity, esp. a tubular
cavity; a vacuole.
From WordNet (r) 1.7 (wn)
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 [syn: {lm}]
2: a cavity or passage in a tubular organ; "the lumen of the
intestine"
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.