Definition

A partial shadow that occurs during an eclipse, where there is a mix of light and dark, or an area where something exists to a lesser degree.

Example

During the solar eclipse, the moon created a penumbra that cast a partial shadow on the Earth.

Conversation

Did you see the eclipse last night?

Yeah, it was amazing! The penumbra was so fascinating to watch.

I know, right? It made everything look so surreal.

Exactly! It felt like we were in a different world for a moment.

Synonyms & Antonyms

Root Explanation

Penumbra → It is formed from "paene" (meaning almost) and "umbra" (meaning shadow). The word "penumbra" refers to the almost shadow or the partial shadow that occurs during an eclipse.

Memory Tip

Think of 'almost' ('paene') and 'shadow' ('umbra') to remember that 'penumbra' describes a partial shadow.

Visually Confused Words