Lewis & Short

ūnĭcornis, e, adj. [unus-cornu], onehorned, having a single horn.

  1. I. Adj.: Indici boves, Plin. 8, 21, 30, § 72: animal, id. 11, 46, 106, § 255: rhinoceros, Tert. adv. Marc. 3, 18; id. adv. Jud. 10.
  2. II. Subst., Vulg. Psa. 91, 11.