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umbra

um·bra

umbra

pronunciation:
uhm br
part of speech: noun
inflections: umbrae
definition 1: a shadow or darkened area.
similar words:
shade
definition 2: the darkest part of the shadow, from which all light is blocked, cast by one heavenly body on another, as in an eclipse or in the center of a sunspot. (Cf. penumbra.)
derivation: umbral (adj.)