umbra plural
um·bra
The plural form of umbra is ˈumbrae
U uDefinitions
- noun plural umbra shade; shadow. 1
- noun plural umbra the invariable or characteristic accompaniment or companion of a person or thing. 1
- noun plural umbra 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). 1
- noun plural umbra a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image. 1