透光率

[ noun ]
the quality of being luminous; emitting or reflecting light
<noun.attribute>
its luminosity is measured relative to that of our sun

Luminous \Lu"mi*nous\, a. [L. luminosus, fr. lumen light: cf. F.
lumineux. See {Luminary}, {Illuminate}.]
1. Shining; emitting or reflecting light; brilliant; bright;
as, the is a luminous body; a luminous color.

Fire burneth wood, making it . . . luminous.
--Bacon.

The mountains lift . . . their lofty and luminous
heads. --Longfellow.

2. Illuminated; full of light; bright; as, many candles made
the room luminous.

Up the staircase moved a luminous space in the
darkness. --Longfellow.

3. Enlightened; intelligent; also, clear; intelligible; as, a
luminous mind. `` Luminous eloquence.'' --Macaulay. `` A
luminous statement.'' --Brougham.

{Luminous paint}, a paint made up with some phosphorescent
substance, as sulphide of calcium, which after exposure to
a strong light is luminous in the dark for a time.

Syn: Lucid; clear; shining; perspicuous.
※ -- {Lu"mi*nous*ly}, adv. --
{Lu"mi*nous*ness}, n.

luminousness \lu"mi*nous*ness\ n.
the quality of being luminous; emitting or reflecting light.

Syn: luminosity, luminance, light.
[WordNet 1.5]