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X chromosome

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noun Genetics.
  1. a sex chromosome of humans and most mammals that determines femaleness when paired with another X chromosome and that occurs singly in males.
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Compare Y chromosome.

Origin of X chromosome

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for x-chromosome

X-chromosome

noun
  1. the sex chromosome that occurs in pairs in the diploid cells of the females of many animals, including humans, and as one of a pair with the Y-chromosome in those of malesCompare Y-chromosome
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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

x-chromosome in Medicine

X-chromosome

n.
  1. The sex chromosome associated with female characteristics, occurring paired in the female and singly in the male sex-chromosome pair.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

x-chromosome in Science

X-chromosome

[ĕkskrōmə-sōm′]
  1. The sex chromosome that in female mammals is paired with another X-chromosome and in males is paired with a Y-chromosome. Very few genes on the X-chromosome have counterparts on the Y-chromosome, and since males have only one X-chromosome, any gene present on it (even if the gene is recessive in females) is expressed in males. In females, one of the two X-chromosomes in each cell is deactivated. See more at sex chromosome. See note at sex.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.