All but the smallest spots show a dark central portion
called the umbra
with a lighter outer area called the penumbra.
Umbra splish.
In a partial lunar eclipse, it partly
enters the umbra
and only part of its surface is darkened.
Umbra tree
caused by fusarium species.
The word usage examples above have been gathered from various sources to reflect current and historical usage.
They do not represent the opinions of YourDictionary.com.