compurgator

[ kom-per-gey-ter ]

/ ˈkɒm pərˌgeɪ tər /

a person who vouches for the innocence and truthful testimony of another.

Origin of compurgator

1525–35; < Medieval Latin, equivalent to compurgā(re) (see compurgation) + -tor -tor

The head of a homestead was an aire, a representative freeman capable of acting as a witness, compurgator and bail.

Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 |Various
I'll be your compurgator for the handle of a fan; I know love has brought many into the world, but let out none.

A Select Collection of Old English Plays, Volume 12 (of 15) |Robert Dodsley
Associated words: compurgation, compurgator, compurgatorial.

Putnam's Word Book |Louis A. Flemming