English

intersibling

From inter- + sibling.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Old English sibling ‘relative, a relation, kinsman’

Today it means

adj Between siblings.

Language periods are conventional ranges, not dates for this word.

Etymograph / intersibling