shade; shadow.

the invariable or characteristic accompaniment or companion of a person or thing.

Astronomy .

the complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off. Compare penumbra ( def. 1a ) .

the dark central portion of a sunspot. Compare penumbra ( def. 1b ) .

a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.

noun

penumbra , shadow , umbrage