wythernamium Save Du Cange WYTHERNAMIUM, Repressalia, pignoris captio, Saxon. wyðer-nam, ex wiðer, contra, adversus, et nam, captio. Fleta lib. 2. cap. 47. § 10 : Si catalla capiat serviens Regis de averiis illius in duplum, nomine Withernamii, etc. Vide supra Withernamium.