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Meaning of PENUMBRA

Pronunciation:  pi'numbru

 
WordNet Dictionary
 
 Definition: 
[n]  a fringe region of partial shadow around an umbra
 

PENUMBRA is a 8 letter word that starts with P.

 

 See Also: shadow

 

 

Webster's 1913 Dictionary
 
 Definition: 
\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.

 

 

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