'sound-transmissive' originates from the combination of 'sound' and 'transmissive', where 'transmissive' is derived from Latin 'transmissivus', meaning 'capable of being transmitted'.

'transmissivus' transformed into the English word 'transmissive', and combined with 'sound' to form 'sound-transmissive'.

Initially, 'transmissive' meant 'capable of being transmitted', and this meaning has largely remained the same in modern usage when combined with 'sound'.