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Definition of Deer fly
1. Noun. A Eurasian species of louse fly in the family Hippoboscidae, ''Lipoptena cervi''; parasites of elk, deer and other bovine animals, sucking blood and laying eggs in the fur of the host animals. ¹
2. Noun. A gold or green eyed horsefly of the genus ''Chrysops'' in the family Tabanidae; pests to cattle, horses and humans, feeding on their blood. ¹
¹ Source: wiktionary.com