Webster's Revised Unabridged Dictionary · 1913

Debtor

Debtor , noun

[Old English dettur, dettour, Old French detor, detur, detour, French débiteur, from Latin debitor, from debere to owe. See Debt.]

One who owes a debt; one who is indebted; -- correlative to creditor.
[I 'll] bring your latter hazard back again, And thankfully rest debtor for the first. — Shakespeare
In Athens an insolvent debtor became slave to his creditor. — Mitford
Debtors for our lives to you. — Tennyson