Strong's G3660 (Greek)

Greek: ὀμνύω (omnýō)

Pronunciation: om-noo'-o

Derivation: 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

Definition: to swear, i.e. take (or declare on) oath

KJV Renderings: swear