[PLURAL PE·NUM·BRAE, PE·NUM·BRAS.]
a shadowy, indefinite, or marginal area.
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The umbra, penumbra and antumbra are three distinct parts of a shadow, created
by any light source after impinging on an opaque object. For a point source ...
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Define penumbra: a space of partial illumination (as in an eclipse) between the
perfect shadow on all sides and the full… — penumbra in a sentence.
Penumbra definition, the partial or imperfect shadow outside the complete
shadow of an opaque body, as a planet, where the light from the source of
n. pl. pe·num·bras or pe·num·brae (-brē). 1. A partial shadow, as in an eclipse,
between regions of complete shadow and complete illumination. 2. The diffuse ...
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(medicine) (in "ischaemic penumbra", after a stroke) A region of the brain that has
lost only some of its blood supply, and retains structural integrity but has lost ...