Here you will find one or more explanations in English for the word Numbra.
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Inumbrate
Inumbrate In*um"brate, v. t. [L. inumbratus, p. p. of
inumbrare to shade.]
To shade; to darken. [Obs.]
PenumbraPenumbra Pe*num"bra, n. [NL., fr. L. paene almost + umbra
shade.]
1. An incomplete or partial shadow.
2. (Astron.) 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.) The part of a picture where the shade
imperceptibly blends with the light. penumbraPenumbra Pe*num"bra, n. [NL., fr. L. paene almost + umbra
shade.]
1. An incomplete or partial shadow.
2. (Astron.) 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.) The part of a picture where the shade
imperceptibly blends with the light. Penumbrala
Penumbrala Pe*num"brala
Of or pertaining to a penumbra; resembling a penumbra;
partially illuminated.
Meaning of Numbra from wikipedia