English

intermedium

From inter- + medium.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *me ‘near, by, with’

…

Proto-Indo-European *médʰyos ‘middle’

Proto-Italic *meðjos ‘middle’

Latin medius ‘middle’

Latin medium

Today it means

noun A medium, or form of media, that conceptually lies between others.

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

Etymograph / intermedium