'lice-transmitted' originates from the combination of 'lice,' referring to small parasitic insects, and 'transmitted,' from Latin 'transmittere,' meaning 'to send across.'

'transmittere' transformed into the Old French word 'transmettre,' and eventually became the modern English word 'transmit.'

Initially, 'transmit' meant 'to send across,' and in the context of diseases, it evolved to mean 'spread from one host to another.'