PENUMBRAS

Noun

penumbras

plural of penumbra

Source: Wiktionary

PENUMBRA

Pe*num"bra, n. Etym: [NL., fr. L. paene almost + umbra shade.]

1. An incomplete or partial shadow.

2. (Astron.)

Definition: 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. Sir I. Newton.

Note: The faint shade surrounding the dark central portion of a solar spot is also called the penumbra, and sometimes umbra.

3. (Paint.)

Definition: The part of a picture where the shade imperceptibly blends with the light.

Source: Webster’s Unabridged Dictionary 1913 Edition

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