ca·lyx 
(kālĭks, kălĭks)
(kālĭks, kălĭks)n. pl. ca·ly·ces (kālĭ-sēz′, kălĭ-) also ca·lyx·es
1. Botany The outermost part of a flower, consisting of the sepals.
2. Anatomy A cuplike structure, such as the collecting structures into which the pelvis of the kidney is divided.
3. Ecclesiastical A calix.
[Latin calyx, calyc-, from Greek kalux.]