Meaning & use
umbra
The fully dark, central part of a shadow where the light source is completely blocked.
See it in a sentence
Observers standing inside the moon's umbra during the eclipse saw the sun completely disappear.
The umbra of a sunspot appears darker than the lighter surrounding region called the penumbra.
A note on using this word
Umbra is contrasted with penumbra, the partially shaded outer region of a shadow where the light source is only partly blocked.
Words with a similar meaning
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