Definition of aphid noun from the Oxford Advanced Learner's Dictionary

 

aphid

 noun
noun
BrE BrE//ˈeɪfɪd//
 
; NAmE NAmE//ˈeɪfɪd//
 
Invertebrates
 
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a very small insect that is harmful to plants. There are several types of aphid, including, for example, greenfly. See related entries: Invertebrates Word Origin late 19th cent.: back-formation from aphides, plural of aphis modern Latin, from Greek, perhaps a misreading of koris ‘bug’ (interpreting the characters κoρ ‘kor’ as αϕ ‘aph’).
See the Oxford Advanced American Dictionary entry: aphid