English

interstream

From inter- + stream.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *srew- ‘to flow’

…

Proto-Germanic *straumaz

Proto-West Germanic *straum

Old English strēam

Middle English streem

Today it means

adj Between streams

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

Etymograph / interstream