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Calyx (anatomy), collective name for several cup-like structures in animal anatomy •
Calyx (botany), the collective name for the sepals of a flower •
Calyce (beetle), a genus of beetles •
Calyx (sponge), a genus of sea sponges •
Calyx of Held, a large synapse in the auditory brainstem structure •
Eubela calyx, species of sea snail •
Renal calyx, a chamber in the kidney that surrounds the apex of the renal pyramids ==Companies==