umbral

Pertaining to shadows

Umbral relates to shadow or shade, especially the darkest part of a shadow.

In astronomy, the umbra is the complete shadow cast during an eclipse—the zone of total darkness where light is fully blocked: The moon entered the umbral shadow.

The word appears in technical and literary contexts, contrasting with penumbral (partial shadow).

shadow

darkness

Total absence of light

shadeDarkness from blocked light
gloomPervasive dimness or dejection
obscurityState of being unknown

silhouette · shroud · veil · murk · dimness · blackness · pall · tenebrous · shadowy · darkened

eclipse

totality

Complete aggregate amount

coronaStar's outermost atmosphere
occultationCelestial body blocking another
syzygyTrilinear celestial arrangement

lunar · solar · transit · magnitude · chromosphere · photosphere · obscuration · darkening · celestial · astronomy

twilight

dusk

Dimming after sundown

gloamingPoetic term for dusk
crepuscularRelating to dusk
nightfallOnset of darkness

eventide · dim · dusky · half-light · dimness · fading · darkening · afterglow · sundown · evening

concealment

hidden

Kept out of sight

secretConcealed information
mysteriousBeyond easy comprehension
veiledConcealed or obscured

obscured · cloaked · shrouded · covert · lurking · unseen · concealed · occult · enigmatic · shadowed

umbral

darkness

totality

dusk

hidden

umbral

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