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From The Collaborative International Dictionary of English v.0.48:
Warranter \War"rant*er\, n. 1. One who warrants, gives authority, or legally empowers. [1913 Webster] 2. (Law) One who assures, or covenants to assure; one who contracts to secure another in a right, or to make good any defect of title or quality; one who gives a warranty; a guarantor; as, the warranter of a horse. [1913 Webster]