a. Geom. [L. UMBILIC-US + -AR. Cf. late L. umbilīcāris (Tertullian).] Of or belonging to the umbilicus.
1843. MacCullagh, in Proc. R. Irish Acad. (1846), II. 458. A focal which is not modular may be called umbilicar, because it intersects the surface in the umbilics. Ibid., 469. A focal point which is at once modular and umbilicar.
1870. Cayley, Math. Papers, VIII. 326. The contacts arise, as will appear, from the umbilici of the ellipsoid, and may be termed ‘umbilicar centres,’ or ‘omphaloi.’
