Albedo

Astronomy. the ratio of the light reflected by a planet or satellite to that received by it.
Meteorology. such a ratio for any part of the earth’s surface or atmosphere.
the white, inner rind of a citrus fruit.
Historical Examples

The asteroid’s efficiency in reflecting sunlight was its albedo.
Rip Foster in Ride the Gray Planet Harold Leland Goodwin

Its “albedo,” in other words, is 0·17, which is precisely that ascribed to the moon.
A Popular History of Astronomy During the Nineteenth Century Agnes M. (Agnes Mary) Clerke

If the asteroid’s albedo matched it, that would be one piece of evidence.
Rip Foster in Ride the Gray Planet Harold Leland Goodwin

Its theoretical mean temperature, taking into account both distance from the sun and albedo, is 34° C. below freezing.
A Popular History of Astronomy During the Nineteenth Century Agnes M. (Agnes Mary) Clerke

The telescopes showed Sennech’s albedo down to a fraction of normal; that, he supposed, would indicate smoke in the atmosphere.
Tulan Carroll Mather Capps

An albedo equal to that of Mars was assumed as the basis of the calculation.
A Popular History of Astronomy During the Nineteenth Century Agnes M. (Agnes Mary) Clerke

If anything of the right size shows up, decelerate until we can get mass and albedo measurements.
Rip Foster in Ride the Gray Planet Harold Leland Goodwin

noun
the ratio of the intensity of light reflected from an object, such as a planet, to that of the light it receives from the sun
(physics) the probability that a neutron passing through a surface will return through that surface
n.

“ratio of light reflected from a surface,” 1859, from Latin albedo, literally “whiteness,” from albus “white” (see alb).
albedo
(āl-bē’dō)
The fraction of the total light striking a surface that gets reflected from that surface. An object that has a high albedo (near 1) is very bright; an object that has a low albedo (near 0) is dark. The Earth’s albedo is about 0.37. The Moon’s is about 0.12.