Definition of calyx in English:

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Pronunciation: /ˈkalɪks/
Pronunciation: /ˈkeɪlɪks/
(also calix)

noun (plural calyces /ˈkalɪsiːz/ /ˈkeɪlɪsiːz/ or calyxes)

1 Botany The sepals of a flower, typically forming a whorl that encloses the petals and forms a protective layer around a flower in bud. Compare with corolla.
Example sentences
  • Similar to the color traits, plant prickles were also evaluated for individual organs including stem, leaf, and flower and fruit calyxes.
  • Unlike with other bulb flowers, the calyxes of amaryllises do not open quickly, so consider this when using them in flower arrangements for certain occasions.
  • The flower has a tubular calyx with four ovate lobes and a corolla with four overlapping petals.
2 Zoology A cup-like cavity or structure, in particular:
2.1A portion of the pelvis of a mammalian kidney.
Example sentences
  • The renal pelvis, calyces, and renal vein were grossly uninvolved.
  • You seem to be having a stone in the lower calyx of the right kidney.
  • In this case, the calyces are compressed by the markedly distended renal pelvis.
2.2The cavity in a calcareous coral skeleton that surrounds the polyp.
Example sentences
  • The polyp lived on top of a tabula in a depression in the top of the coral called the calyx.
2.3The plated body of a crinoid, excluding the stalk and arms.
Example sentences
  • The pattern of proximal axes being more aborally inclined than are distal axes is similar to that in C axes of crinoid calyx plates.
  • Although very few crinoid calyxes were encountered in the samples, columnals were ubiquitous and provided the basis for identification of crinoid genera.
  • The characters that make this species distinct from the members of the C. sampsoni clade are primarily the thin-plated calyx and basal plates, which are higher than wide.


Late 17th century: from Latin, from Greek kalux 'case of a bud, husk', related to kaluptein 'to hide'.

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