01 n. 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 th…
pl.
Lumina, Lumens ((#))
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1.
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.(Photom.)
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2.
An opening, space, or cavity, esp. a tubular cavity; a vacuole.(Biol.)