UMBRA
Dictionary of Science, Literature and Art · 1842 · p. 48
A shadow. In Astronomy, this term is applied to the dark cone projected from a planet ot satellite on the side opposite to the sun. See Eclipse. [s. 1287]
Bu kavram başka kaynaklarda da geçiyor
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Zell's Condensed Dictionary (1879)
Lexicon Latinum Seu Corpus Phraseologiae (1878)
Dictionary of Science, Literature and Art (1854)
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