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X-ray astronomy
X-ray crystallography
X-ray diffraction
X-ray fluorescence
X-ray spectrum
X-ray star
X-ray therapy
X-ray tube
X12
Xanadu
xanth-
xanthan gum
xanthate
xanthene
xanthic acid
xanthine
xantho-
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X chromosome
X chromosome (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.
See also  Y chromosome
Encarta® World English Dictionary [World English Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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