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Unicorn. Old French, unicorne. Latin, unicornis. Literally, one-horned: unus, one and cornu,a horn. A fabulous animal resembling a horse with one horn.

Peter S. Beagle (1968). “The last unicorn”, Del Rey
Unicorn. Old French, unicorne. Latin, unicornis. Literally, one-horned: unus, one and cornu,a horn. A fabulous animal resembling a horse with one horn.