UMBRA

Umbra

The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. For a point source only the umbra is cast.

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umbra

Noun

  1. A shadow.
  2. The central region of a sunspot.


The above text is a snippet from Wiktionary: umbra
and as such is available under the Creative Commons Attribution/Share-Alike License.

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