You know what it looks like… but what is it called?
TAKE THE QUIZpenumbra
noun
pen·um·bra
pə-ˈnəm-brə
plural penumbrae
pə-ˈnəm-(ˌ)brē
-ˌbrī
or penumbras
1
a
: a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light
b
: a shaded region surrounding the dark central portion of a sunspot
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Merriam-Webster unabridged
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