PENUMBRA
Pe*num"bra, n. Etym: [NL., fr. L. paene almost + umbra shade.]
1. An incomplete or partial shadow.
2. (Astron.)
Defn: 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.)
Defn: The part of a picture where the shade imperceptibly blends with the light.
PENUMBRALA
Pe*num"brala.
Defn: Of or pertaining to a penumbra; resembling a penumbra; partially illuminated.
PENURIOUS
Pe*nu"ri*ous, a. Etym: [From Penury.]