Umbra
noun /ˈʌm.brə/ — The fully dark central region of a shadow
Definition
The innermost, darkest part of a shadow — where direct light is completely blocked. In an eclipse, the umbra is the region of total darkness.
Beyond the definition
The shadow's shadow — the darkest part of the dark. The umbra is what's left when every light has been blocked.
Origin & history
From Latin 'umbra' (shade, shadow, ghost). The same root as 'umbrella' (little shade), 'umber' (earth shadow), and 'adumbrate' (to outline in shadow).
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
Totality in a solar eclipse means standing in the umbra of the moon — a shadow 70 miles wide moving at 1,500 mph.
The garden remained in deep umbra all afternoon — the tall wall cut the sun entirely.
She moved through her grief as if through an umbra — the light was there, but none of it reached her.
Synonyms
Antonyms
light, penumbra, illumination
Related words
Word in the Wild
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Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Intense Darkness of Conflict
Two adults argue at a table in a room where the shadow and light contrast makes the hostility of their disagreement clear.
The umbra is the darkest part of a shadow. The intense, deep shadows that surround the disputing parties at the table provide a visual analogy for the umbra: the darkness here is total and absolute, mirroring the 'darkness' of their hostile, aggressive words where all light and reasonableness are completely blocked.
Image credit: Wordspun · AI-generated conceptual illustration