Pronunciation (US) IPA (key): /ælˈbi.doʊ/ Audio (US)(file) Hyphenation: al‧be‧do Noun Singular albedo Plural albedos or albedoes (physics) (meteorology) (astronomy) An albedo is a fraction of incident light or radiation reflected by a surface, that is usually expressed as a percentage. (botany) The albedo is the whitish inner portion of the rind of citrus fruits. Wikiwand - on Seamless Wikipedia browsing. On steroids.