[Sp., factitious dim. of tres three.] A Spanish card-game; = OMBRE.
1829. W. Irving, in Life & Lett. (1864), II. 403. The countess comes up to the Alhambra with a little party to play at Tresillo.
1878. H. H. Gibbs, Ombre, 4. The game [Ombre] is now played in Spain under the name of Tresillo, meaning a threesome game.
