Definition of wis in English:

wis

Line breaks: wis

Entry from British & World English dictionary

verb (wisses, wissing, wissed)

[no object] archaic
Know well: and, you wis, Lord Julian is a hasty man

Origin

early 16th century: originally in I wis, alteration of the obsolete adverb iwis 'certainly', erroneously interpreted as 'I know' (associated with wist, past tense of wit2).

Definition of wis in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal