'transmissible' originates from Latin, specifically the word 'transmissibilis', where 'trans-' meant 'across' and 'mittere' meant 'to send'.

'transmissibilis' transformed into the French word 'transmissible', and eventually became the modern English word 'transmissible' through Middle English.

Initially, it meant 'capable of being sent across', but over time it evolved into its current meaning of 'capable of being transmitted from one person or organism to another'.