Etymology
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aphid (n.)

1849, Englished from Modern Latin aphides, plural of aphis, coined by Linnaeus (1758), though where he got it and why he applied it to the plant louse are mysteries. The theory favored by OED as "least improbable" is that it derives from the plural of Greek apheidēs "unsparing, lavishly bestowed," in reference either to the "prodigious rate of production" of the insects or their voracity. The colloquial name was ant-cow (1847). Related: Aphidian (1855).

updated on September 23, 2022

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Definitions of aphid from WordNet

aphid (n.)
any of various small plant-sucking insects;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.