hemicyˈlindrical,a. Having the form of half a cylinder, divided in the direction of its axis. 1854in Mayne Expos.Lex.1880Libr.Univ.Knowl. (N.Y.) V. 771 The articular surface of the condyles is hemicylindrical.1883Buchan & Stewart in Encycl.Brit. XVI. 162/2 By means of a hemicylindrical lens.