cup

A small drinking ve el; the contents of such a ve el; any structure (e. g., the calyx of a flower) shaped like a drinking ve el, germ c. See gastrula. glaucomatous c. The so called "pre ure excavation," which refers to the condition of the optic disk in glaucoma, optic c's. In comparative anatomy, c.-shaped or bell-shaped depre ions lined with epithelial cells, usually also provided with pigment cells and connected with a nervous filament; they subserve vision. [Ang.-Sax., cupp, Gr., kupe, hollow.]