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xanthine
xantho-
xanthoma
xanthomatosis
xanthone
xanthophyll
xanthopterin
Xanthus
XC
XD
Xe
xebec
xen-
xenia
xeno-
xenobiotic
xenocryst
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X-chromosome
X-chro·mo·some (plural X-chromosomes)


noun 
Definition:
 
sex chromosome: a chromosome present in both sexes that plays a role in determining the sex of an individual. Female mammals carry two X chromosomes and males carry one.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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