Image credit, Bitte...Vocabulary lesson or word of the day - as you like.
penumbra \pi-NUHM-bruh\, noun:
1. An area in which something exists to an uncertain degree.
2. Astronomy. 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.
3. The grayish marginal portion of a sunspot.
Penumbra was coined as an astronomy term in 1660, but gained widespread modern usage after Supreme Court Justice William O. Douglas wrote about penumbras in the U.S. Constitution, in the landmark 1965 case Griswold v. Connecticut.
...I'll know it when I see it?
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