Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of penumbra is as below...

Umbra :: Umbra (n.) The fainter part of a sun spot; -- now more commonly called penumbra.

Umbra :: Umbra (n.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra..

Penumbra :: Penumbra (n.) The shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light..

Penumbrala :: Penumbrala () Of or pertaining to a penumbra; resembling a penumbra; partially illuminated.

Penumbra :: Penumbra (n.) The part of a picture where the shade imperceptibly blends with the light.

Penumbra :: Penumbra (n.) An incomplete or partial shadow.

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