Definitions

1. adjective

of or relating to or situated in the partial shadow of an object, especially the outer part of a shadow

“The penumbral moon glowed softly in the night sky.”

2. noun

a partial or outer shadow, especially of the moon during a lunar eclipse

“During the lunar eclipse, the penumbral shadow fell across the landscape.”

3. adverb

in a partial or outer shadow, especially of the moon during a lunar eclipse

“The penumbrally lit garden was a peaceful oasis in the city.”

4. noun

a partial or outer part of a shadow, especially of the moon during a lunar eclipse

“The penumbral part of the shadow fell across the landscape.”