centromere

[sen-truh-meer]
noun Cell Biology.
a specialized structure on the chromosome, appearing during cell division as the constricted central region where the two chromatids are held together and form an X shape.

Origin:
1920–25; centro- + -mere

centromeric [sen-truh-mer-ik, -meer-] , adjective
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World English Dictionary
centromere (ˈsɛntrəˌmɪə)
 
n
the dense nonstaining region of a chromosome that attaches it to the spindle during mitosis
 
centromeric
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

centromere cen·tro·mere (sěn'trə-mēr')
n.
The most condensed and constricted region of a chromosome to which the spindle fiber is attached during mitosis. Also called kinetochore.

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
centromere  [%PREMIUM_LINK%]     (sěn'trə-mîr')  Pronunciation Key 
The region of the chromosome to which the spindle fiber is attached during cell division (both mitosis and meiosis). The centromere is the constricted point at which the two chromatids forming the chromosome are joined together. See more at meiosis, mitosis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for centromeres
The term is used so long as the centromeres remain in contact.
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