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black fly definition

☆ black fly

any of a family (Simuliidae) of small, dark, dipterous flies of North American forests and mountains, whose larvae live attached to rocks in swift water: most species live on the blood of mammals and may transmit disease

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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