'aspersory' originates from Late Latin, specifically the word 'aspersorius', where the element 'asperg-' (from Latin 'aspergere') meant 'to sprinkle'.

'aspersory' changed from Late Latin 'aspersorius' and Medieval Latin forms related to 'aspersio' (meaning 'a sprinkling' or, metaphorically, 'a casting of blame'), passed through Middle English influence from the noun 'aspersion', and eventually became the modern English adjective 'aspersory'.

Initially it was connected with the literal sense 'relating to sprinkling', but over time it evolved into a figurative sense meaning 'casting negative remarks' or 'slandering'.