
UMBRA
[noun]
1. shade; shadow; shadow; darkness; a dark area, especially the blackest part of a shadow from which all light is cut off.
2. the invariable or characteristic accompaniment or companion of a person or thing.
3. Astronomy: a) the complete or perfect shadow of an opague body, as a planet, where the direct light from a source of illumination is completely cut off. Compare penumbra. b) the dark central portion of a sunspot.
4. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.
Etymology: from Latin umbra, “shade, shadow.”








