cotwin

English

Alternative forms
  • co-twin

Etymology

co- +‎ twin

Noun

cotwin (plural cotwins)

  1. A twin's twin.
    • 2013, Issues in Clinical Psychology, Psychiatry, and Counseling:
      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.
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