English

intersonic

From inter- + sonic.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *swenh₂- ‘to sound’

Proto-Indo-European *swónh₂os

Proto-Italic *swonos

Latin sonus ‘sound, noise’

English sonic

Today it means

adj Having a speed between that of the dilational wave and the shear wave

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

Etymograph / intersonic