'aphidlike' originates from English (compound), specifically formed from 'aphid' + the suffix '-like', where 'aphid' ultimately comes from New Latin 'Aphidoidea' (from Greek 'aphis') and '-like' meant 'having the form of'.

'aphid' entered English via New/Neo-Latin 'Aphidoidea' (from Greek 'aphis'); the adjectival suffix '-like' (from Old English 'līc', meaning 'body, form') combined with 'aphid' to produce the compound adjective 'aphidlike'.

Initially it literally meant 'like an aphid' (a resemblance to the insect); over time the meaning has remained largely literal, used to describe appearance or characteristics resembling an aphid.