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[kuh-ley-zuh] /kəˈleɪ zə/
noun, plural chalazas, chalazae
[kuh-ley-zee] /kəˈleɪ zi/ (Show IPA)
Zoology. one of the two albuminous twisted cords which fasten an egg yolk to the shell membrane.
Botany. the point of an ovule or seed where the integuments are united to the nucellus.
Origin of chalaza
1695-1705; < New Latin < Greek: hail, lump
Related forms
chalazal, chalazian
[kuh-ley-zee-uh n] /kəˈleɪ zi ən/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for chalaza


noun (pl) -zas, -zae (-ziː)
one of a pair of spiral threads of albumen holding the yolk of a bird's egg in position
the basal part of a plant ovule, where the integuments and nucellus are joined
Derived Forms
chalazal, adjective
Word Origin
C18: New Latin, from Greek: hailstone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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chalaza in Science
Plural chalazae (kə-lā'zē) or chalazas
  1. One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.

  2. The region of a plant ovule that is opposite the micropyle, where the integuments and nucellus are joined.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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