I once observed a young spider approaching an aphid, which was facing its enemy.
aphid (af'-id) The plant louse, of which there are a great many kinds.
Let the pupils see an aphid sucking the juice of a plant; this may be done by bringing in a twig infested by aphids.
He laughed in my face, and brought forward certain well-known facts in the reproduction of the aphid or cabbage-louse.
The reproduction of the aphid constitutes one of the most interesting chapters in the history of the animal kingdom.
The heterogamy of the allied Coccid is practically the same as that of the aphid.
1884, anglicized 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 apheides "unsparing, lavishly bestowed," in reference either to the "prodigious rate of production" of the insects or their voracity. They also are known as ant-cows.