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Origin and history of umbra
umbra(n.)
1590s, "phantom, ghost," a figurative use from Latin umbra "shade, shadow" (see umbrage). The astronomical sense of "shadow cast by the earth or moon during an eclipse" is recorded by 1670s. The meaning "an uninvited guest accompanying an invited one" is from 1690s in English, from a secondary sense among the Romans. Related: Umbral.
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