noun, genitive Mo·noc·er·o·tis [muh-nos-uhroh-tis] /məˌnɒs əˈroʊ tɪs/. Astronomy.

  1. the Unicorn, a constellation south of Gemini and east of Orion.

noun Latin genitive Monocerotis (məˌnɒsəˈrəʊtɪs)

  1. a faint constellation on the celestial equator crossed by the Milky Way and lying close to Orion and Canis Major

n.c.1300, “the unicorn,” from Old French monoceros “unicorn,” from Latin monoceros, from Greek monokeros, from mono- “single” (see mono-) + keras “horn” (see kerato-). This is a modern constellation, generally supposed to have been first charted by Bartschius as Unicornu; but Olbers and Ideler say that it was of much earlier formation, the latter quoting allusions to it, in the work of 1564, as “the other Horse south of the Twins and the Crab”; and Scaliger found it on a Persian sphere. [Richard Hinckley Allen, “Star Names and Their Meanings,” London: 1899]

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