'aphidid' originates from New Latin, specifically the word 'Aphididae', where 'Aphis' meant 'plant louse' and the suffix '-idae' denoted a family.

'aphidid' developed from the New Latin family name 'Aphididae' (and from English 'aphid', from the 17th century), eventually forming the English derivative 'aphidid' used as a noun or adjective.

Initially it referred to the plant louse itself ('Aphis' / aphid); over time it came to denote both a member of the aphid family and adjectives meaning 'relating to aphids'.