'diploidy' originates from Greek, specifically the word 'diploos,' where 'diplo-' meant 'double' and the suffix '-idy' refers to a state or condition.

'diploidy' was formed in modern scientific English from the Greek root 'diploos' and the suffix '-idy,' and became the standard term in biology for the state of having two chromosome sets.

Initially, it meant 'the condition of being double,' but over time it evolved into its current meaning of 'the state of having two sets of chromosomes.'