Emily Dickinson Lexicon

CUCK'OLD, n. [Chaucer, cokewold. The first syllable is Fr. cocu, which seems to be the first syllable of coucou, cuckow; W. cog; Sw. gök; Dan. giög. The Dutch call a cuckold, hoorndraager, a horn-wearer; and the Germans, hahnrei, from hahn, a cock; the Spaniards and Portuguese cornudo, Ital. cornuto, horned; Fr. cornard, (obs.) See Spelman's Glossary, voc. Arga.]

A man whose wife is false to his bed; the husband of an adulteress. – Swift.