Lewis & Short

dēsultor, ōris, m. [desuesco], a leaper, vaulter, the technical designation of a sort of riders, who, in the circus-games, leaped from one horse to another without stopping.

  1. I. Prop., Varr. R. R. 2, 7, 15; Liv. 23, 29; 44, 9; Manil. 5, 85.
  2. II. Trop., a fickle, inconstant person: amoris, an inconstant lover, Ov. Am. 1, 3, 15; cf. bellorum, Sen. Suas. 1, § 8.