albedo

1. The fraction of incident light or radiation reflected by a surface or body, commonly expressed as a percentage. (countable, uncountable)
2. The whitish inner portion of the rind of citrus fruits that is a source of pectin, commonly referred to as the pith. (countable, uncountable)
3. One of the four major stages of the magnum opus, involving purification of the prima materia. (countable, uncountable)

Plural albedos