The taste of citrus fruits is created by a handful of substances, including citric acid (so named because it is typical of the family), sugars, and certain bitter phenolic compounds, which are usually concentrated in the albedo and peel.
-- Harold McGee, On Food and Cooking, 2004
From deep space the rift had been visible only as a change in albedo, a dark scar slicing across the world.
-- Alastair Reynolds, Absolution Gap, 2005
Albedo entered English in the 1850s. It comes from the Latin word albēdō meaning "whiteness."