ὀμνύω
A prolonged form of a primary but obsolete omo, for which another prolonged form (omoo {om-o'-o}) is used in certain tenses
a prolonged form of a primary, but obsolete ὄμω ómō, for which another prolonged form ὀμόω omóō om-o'-o is used in certain tenses; to swear, i.e. take (or declare on) oath:—swear.
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