2 occurrences in 2 dictionaries
Reference: Jehovahnissi
Morish
Jeho'vah-nis'si
Name, signifying 'Jehovah my banner,' which Moses gave to the altar he built after the defeat of Amalek. Ex 17:15.
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Smith
Jeho'vah-nis'si
(Jehovah my banner), the name given by Moses to the altar which he built in commemoration of the discomfiture of the Amalekites.