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.