cotwin

C3O1T1W4I1N1

noun

A twin's twin.

Scrabble 11
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Meanings

nouncotwin (plural cotwins)

plural cotwins · alternative co-twin

  1. A twin's twin.

    In contrast, if a psychopathologic feature is acquired as a result of an environmental factor unique to the exposed twin, eg, the traumatic event, their cotwins should not have an increased incidence of the feature.

    2013, Issues in Clinical Psychology, Psychiatry, and Counseling

Origin

From co- + twin.

Full word history & related roots →
Cite this entry
APA

cotwin. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/cotwin

MLA

“cotwin.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cotwin. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “cotwin,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/cotwin.

Source: cotwin on Wiktionary, CC BY-SA 4.0.