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From our dictionary:
pe•num•bra
(pi•num'bru),
—n.,
—pl. -brae (-brE), -bras.
1. Astron.
a. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a).
b. the grayish marginal portion of a sunspot. Cf. umbra (def. 3b).
2. a shadowy, indefinite, or marginal area.
(pi•num'bru),
—n.,
—pl. -brae (-brE), -bras.
1. Astron.
a. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a).
b. the grayish marginal portion of a sunspot. Cf. umbra (def. 3b).
2. a shadowy, indefinite, or marginal area.
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