penumbra
penumbra
Definition
penum·bra (pi num′brə)
noun pl. -·brae′-brē′ or -·bras
- the partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse
- the less dark region surrounding the dark central area of a sunspot
- a vague, indefinite, or borderline area
Etymology: ModL < paene, almost (see passion) + umbra, shade
penum′·bral adjective
penumbra
Usage Examples
Adjective modifier
- ischaemic: Group differences in average volume of ischaemic penumbra salvaged will be analyzed by t-test, adjusting for baseline differences in prognostic variables.
Converse of object
- call: All but the smallest spots show a dark central portion called the umbra with a lighter outer area called the penumbra.
- follow: Well, consider the following penumbra of events that surround the current rumpus.
Converse of subject
- surround: It is surrounded by the penumbra that receives some light from the light source.
Modifies a noun
- effect: The penumbra effect may be compounded by the presence of variable blood flow through cutaneous pulsatile venules.
penumbra Quotes
A penumbra of somber dignity has descended over his reputation.
Browse dictionary entries near penumbra
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- pentyl
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- Pentothal Sodium
- pentoside
