com·pur·ga·tor /ˈkɑm(ˌ)pɚ/
Com·pur·ga·tor n. One who bears testimony or swears to the veracity or innocence of another. See Purgation; also Wager of law, under Wager.
All they who know me . . . will say they have reason in this matter to be my compurgators. --Chillingworth.
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