English
intersister
From inter- + sister.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *swésōr ‘sister’
Proto-Germanic *swestēr ‘sister’
Proto-West Germanic *swester ‘sister’
Old English sweostor ‘sister’
Middle English suster ‘sister’
English sister
Today it means
adj Between sisters
Language periods are conventional ranges, not dates for this word.
Etymograph / intersister