[key-liks, kal-iks]
noun, plural calyxes, calyces [kal-uh-seez, key-luh-] .
Botany. the outermost group of floral parts; the sepals.
Anatomy, Zoology. a cuplike part.

1665–75; < Latin < Greek kályx husk, covering, akin to kalýptein to veil, cover

calycate [kal-i-keyt] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calyx (ˈkeɪlɪks, ˈkælɪks)
n , pl calyxes, calyces
1.  Compare corolla the sepals of a flower collectively, forming the outer floral envelope that protects the developing flower bud
2.  any cup-shaped cavity or structure, esp any of the divisions of the human kidney (renal calyx) that form the renal pelvis
[C17: from Latin, from Greek kalux shell, from kaluptein to cover, hide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1680s, from L. calyx, from Gk. kalyx "seed pod, husk, outer covering" (of a fruit, flower bud, etc.), from root of kalyptein "to cover, conceal" (see cell). The proper plural is calyces. Some sources connect the word rather with Gk. kylix "drinking cup."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

calyx ca·lyx (kā'lĭks, kāl'ĭks)
Variant of calix.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
calyx   (kā'lĭks, kāl'ĭks)  Pronunciation Key 
The sepals of a flower considered as a group. The calyx is the outermost whorl of a flower. See more at sepal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sepals-The leaves or segments of the calyx, or outermost envelope of an
  ordinary flower.
When polyps are physically stressed, they contract into their calyx so that
  virtually no part is exposed above their skeleton.
Calcium carbonate is secreted by reef-building polyps and forms a protective
  cup called a calyx within which the polyps sits.
The epidermis is thin and an enlarged calyx adheres to the base of the fruit.
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