Lewis & Short

dēbĭtor, ōris, m. [debeo], a debtor; cf.: nexus, obaeratus.

  1. I. Lit. (quite class.), Cic. Off. 2, 22, 78; id. Flacc. 20, 48; id. Pis. 35, 86; Caes. B. C. 3, 1; 3, 20; Quint. 3, 6, 84; * Juv. 16, 40 et saep.: aeris, * Hor. S. 1, 3, 86.
  2. II. Trop. (mostly poet., and perh. not ante-Aug.).
    1. A. (after debeo, no. II. A.): voti, one whose wish has been granted, and who is hence bound to perform his vow, Mart. 9, 42, 8: mercede soluta Non manet officio debitor ille tuo, Ov. Am. 1, 10, 46; Sen. Contr. 1, 1, 11; cf. Vulg. Rom. 1, 14.
      More freq.,
    2. B. (after debeo, no. II. B.), one who is indebted or under obligation to some one for something; constr. with gen. of the thing, and dat. of the person: qui debitor est vitae tibi suae, Ov. Pont. 4, 1, 2: animae hujus, id. Tr. 1, 5, 10: animi amici, id. Pont. 4, 8, 6: habebis ipsum gratissimum debitorem, Plin. Ep. 3, 2 fin.