noun, plural al·be·dos.

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


  1. 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
  2. physics the probability that a neutron passing through a surface will return through that surface

“ratio of light reflected from a surface,” 1859, from Latin albedo, literally “whiteness,” from albus “white” (see alb).

  1. 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.
56 queries 0.582