What is the meaning of penumbra?

noun

  • A fringe region of partial shadow around an umbra. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). Penumbra. Retrieved September 21, 2026, from http://smartdefine.org/penumbra/definitions/1245052
ChicagoWordNet. 2010. "Penumbra" http://smartdefine.org/penumbra/definitions/1245052 (accessed September 21, 2026).
HarvardWordNet 2010, Penumbra, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/penumbra/definitions/1245052>.
MLAWordNet. "Penumbra" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/penumbra/definitions/1245052>
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