- [Bot] The covering of a flower. See Flower.
- [Anat] A cuplike division of the pelvis of the kidney, which surrounds one or more of the renal papillæ.
Note: ☞ The calyx is usually green and foliaceous, but becomes delicate and petaloid in such flowers as the anemone and the four-o'clock. Each leaf of the calyx is called a sepal.
Etymology: L. calyx -ycis, fr. Gr. ka`lyx husk, shell, calyx, from the root of kaly`ptein to cover, conceal. Cf. Chalice Helmet