noun pl. albedos -·dos or albedoes -·does

1. Astron. the reflecting power of a planet, satellite, or asteroid, expressed as a ratio of reflected light to the total amount falling on the surface
2. Physics the degree to which a surface reflects subnuclear particles, esp. neutrons, that strike it: expressed as the ratio of the number of particles that leave the surface in any direction to the number that strike it

Etymology: LL(Ec), whiteness < L albus, white: see elf