To hear audio pronunciation of this topic, purchase a subscription or log in.

pl. lumina [L. lumen, stem lumin-, light, source of light, splendor]

1. The space within an artery, vein, intestine, or tube.
2. A unit of light, the amount of light emitted in a unit solid angle by a uniform point source of one international candle.
SEE: light unit; SEE: candela

There's more to see -- the rest of this topic is available only to subscribers.