geodesicPronunciation: /ˌdʒiːə(ʊ)ˈdɛsɪk, -ˈdiːsɪk/Definition of geodesic adjective 1relating to or denoting the shortest possible line between two points on a sphere or other curved surface. (of a dome or other structure) constructed from struts which follow geodesic lines and typically form an open framework of triangles and polygons. 2another term for geodetic. noun a geodesic line or structure. Origin: early 19th century: from geodesy + -icgeodesic in other Oxford dictionaries Definition of geodesic in the US English dictionary