fortifiable,a.|ˈfɔːtɪfaɪəb(ə)l| [f. fortify v. + -able; cf. F. fortifiable.] That may be fortified. 1609Overbury Observ. 17 Prov.Wks. (1856) 223 The countrey every where fortifiable with water.1755in Johnson.1886Ruskin Præterita I. vii. 207 The quadrilateral plan of my fortifiable dispositions.