albedo
noun
al·be·do
al-ˈbē-(ˌ)dō
plural albedos
1
: reflective power
specifically
: the fraction of incident radiation (such as light) that is reflected by a surface or body (such as the moon or a cloud) compare reflectance
2
: the whitish, spongy inner part of the rind of a citrus fruit : the mesocarp of a hesperidium
The trouble with grapefruit is that however carefully you peel it, some of the white stuff always sticks to the fruit. The spongy white tissue, called albedo, is quite bitter, and it clings with the tenacity of lichen.—Discover
compare flavedo
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Merriam-Webster unabridged
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