/ ˈeɪfɪd; NAmE / noun
a very small insect that is harmful to plants. There are several types of aphid, including, for example, greenfly .
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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 κορ kor as αϕ aph).