umbra
um·bra / ˈəmbrə/ • n. (pl. -bras or -brae / -ˌbrē; -ˌbrī/ ) the fully shaded inner region of a shadow cast by an opaque object, esp. the area on the earth or moon experiencing the total phase of an eclipse. Compare with penumbra. ∎ Astron. the dark central part of a sunspot. ∎ chiefly poetic/lit. shadow or darkness.DERIVATIVES: um·bral adj.
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