English

interplacental

From inter- + placental.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Hellenic *pləks

…

Ancient Greek πλακοῦς ‘flat cake’

Ancient Greek πλακόεντα

Latin placenta

Latin placentalis

Today it means

adj Between placentas.

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

Etymograph / interplacental