Definition of "calyx"

(botany) The outermost whorl of flower parts, comprising the sepals, which covers and protects the petals as they develop.  examples

(zoology, anatomy) Any of various cup-like structures.

1. A chamber in the mammalian kidney through which urine passes.  examples

2. The crown containing the viscera of crinoids and similar echinoderms, entoprocts, and the polyps of some cnidarians.  examples

3. A funnel-shaped expansion of the vas deferens or oviduct of insects.  examples

4. A flattened cap of neuropil in the brain of insects.  examples