umbonulate (umbonulat)

[ a, Umbilicus of nulus, dim. of L. umbo (n-), a bo , knob: see umbo.] In bot., terminated by a very small bo or umbo. 3. In bot.: (at) [cap.] An old generic name (A. P. de Candolle, 1801) for the navelwort, Cotyledon Umbilicus. (b) The part of a seed by which it is attached to the placenta; the hilum. See cut under hilum. (c) A depre ion or an elevation about the center of a given surface. Henslow.-4. In antiq., an ornamented or painted ball or bo fastened upon each end of the stick on which manuscripts were rolled. - 5. In geom., a term used by the older geometers as synonymous with focus; in modern works, a point in a surface through which all lines of curvature pa .-6. The raised central bo of a large plateau or dish, often made to fit the hollow foot of the ewer which stands upon it and forms one design with the dish. umbiliferous (um-bi-lif'e-rus), a. [ of contact.