geodesic Syllabification: (ge·o·des·ic)Pronunciation: /ˌjēəˈdesik, -ˈdē-/Definition of geodesic adjective 1of, relating to, or denoting the shortest possible line between two points on a sphere or other curved surface. 2another term for geodetic. noun a geodesic line or structure. geodesic in other Oxford dictionaries Definition of geodesic in the British & World English dictionary