onshore Syllabification: (on·shore)Pronunciation: /ˈänˈSHôr, ˈôn-/Translate onshore | into Italian | into Spanish Definition of onshore adjective & adverb situated or occurring on land: [as adjective]:an onshore oil field (especially of the direction of the wind) from the sea toward the land. onshore in other Oxford dictionaries Definition of onshore in the British & World English dictionary