Relating to or involving divination; having the nature or character of divining or prophecy.
From 'divine' plus the variant suffix '-ail' (a rare adjectival ending from Old French). This is an extremely archaic and obsolete term, replaced by more modern forms like 'divinatory.'
The suffix '-ail' survives in English mainly in old words like 'betrayal'—it's a fossil of Old French influence, and words like 'divinail' show how English once had different ways to form adjectives that didn't survive.
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