Lewis & Short

ter-uncĭus, ii, m. (sc. nummus) [uncia].

  1. I. Lit., three twelfths of an as, a quarter-as, Varr. L. L. 5, § 174 Müll.; Plin. 33, 3, 13, § 45.
      1. 2. Transf., a trifle: sic in provinciā nos gerimus, ut nullus teruncius insumatur in quemquam, i. q. not a farthing, not a cent, Cic. Att. 5, 17, 2; 6, 2, 4; id. Fam. 2, 17, 4; id. Fin. 3, 14, 45: non jam teruncii faciunt, Plaut. Capt. 3, 1, 17; App. Mag. p. 323, 14.
  2. II. Of inheritances, the fourth part: Curius fecit palam te (heredem) ex libellā, me ex teruncio, Cic. Att. 7, 2, 3.