triple X

A form of triple X syndrome — A form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female, sometimes leading to tall stature, learning disabilities, and/or epicanthic folds.

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Meanings

nountriple X (uncountable)
  1. abbreviationellipsisuncountableEllipsis of triple X syndrome.

    When females receive an extra X chromosome, this can result in triple X or 47, XXX. Physical and behavioral features vary but may include increased height and risk of cognitive disabilities, particularly involving speech and language. One in 1000 girls is born with triple X.

    2009, A Balasubramanian; J Koontz, C A Reynolds, “Genetics and Inheritance”, in Janette B. Benson, Marshall M. Haith, editors, Language, Memory, and Cognition in Infancy and Early Childhood, Kidlington: Academic Press, →ISBN, page 184

Synonyms & antonyms

Also see
triple x syndrome
Cite this entry
APA

triple X. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/triple%20X

MLA

“triple X.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/triple%20X. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “triple X,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/triple%20X.

Source: triple X on Wiktionary, CC BY-SA 4.0.