- In botany the calyx is the sepals of a flower,
taken as a group. The calyx is usually green in color and protects the
flower when it is in bud. When the flower opens, the calyx surrounds
the carpels, petals,
and stamens, and forms the outer whorl
of the perianth.
- In anatomy, the calyx is a cup-shaped part, especially any of the divisions of the pelvis of
the kidney. Each calyx receives urine from the urine-collecting tubes in one sector of the kidney. (Plural