plural umbras or umbrae
ˈəm-(ˌ)brē
-ˌbrī
1
a
: a conical shadow excluding all light from a given source
specifically
: the conical part of the shadow of a celestial body excluding all light from the primary source
b
: the central dark part of a sunspot
2
: a shaded area
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Merriam-Webster unabridged
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