diaphragm

The story

1. Ancient Greek · derived fromδιάφραγμα“partition”
2. Middle English · derived fromdiafragma
3. English todaydiaphragm

From Middle English diafragma, Ancient Greek διάφραγμα (diáphragma, “partition”), from διά (diá, “across”) and φράγμα (phrágma, “barrier”), from the verb φράσσω (phrássō). First attested in the late 14th century.