X chromosome

noun

: a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes compare y chromosome

Examples of X chromosome in a Sentence

Recent Examples on the Web
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With the most common types, the faulty gene is located on the X chromosome. Beth Warren, The Tennessean, 21 Aug. 2025 Females have two X chromosomes, and males have an X chromosome and a Y chromosome. Greta Cross, USA Today, 17 May 2025 People assigned female at birth have two X chromosomes, a fundamental advantage over XY, the chromosomes males have at birth. Starre Vartan, CNN Money, 7 July 2025 What about women who have Turner syndrome or only have one X chromosome or men with Klinefelter syndrome with an XXY karyotype? Naperville Sun, Chicago Tribune, 20 June 2025 See All Example Sentences for X chromosome

Word History

First Known Use

1911, in the meaning defined above

Time Traveler
The first known use of X chromosome was in 1911

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Cite this Entry

“X chromosome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/X%20chromosome. Accessed 29 Aug. 2025.

Kids Definition

X chromosome

noun
: a sex chromosome that is associated with femaleness and usually occurs paired in each female cell and single in each male cell in organisms (as human beings) in which the male normally has two unlike sex chromosomes compare y chromosome

Medical Definition

X chromosome

noun
: a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes compare y chromosome

More from Merriam-Webster on X chromosome

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