'purebreed' originates from the combination of 'pure' and 'breed', where 'pure' meant 'unmixed' and 'breed' referred to 'a group of animals with common ancestry'.

'purebreed' evolved from the Middle English word 'brede', which referred to 'a group of animals with common ancestry', and eventually became the modern English word 'purebreed'.

Initially, it meant 'a group of animals with common ancestry', but over time it evolved into its current meaning of 'an animal bred from parents of the same breed or variety'.