horn fly
noun
: a small dark gray European dipteran fly (Haematobia irritans) that has been introduced into North America where it is a blood-sucking pest especially of cattle
Example Sentences
Recent Examples on the Web Suzan Murray, director of the Smithsonian’s Global Health Program, suggests that climate change may play a role: Insects such as horn flies that could be transmitting parasites could be thriving in generally warmer and wetter conditions. 
Jacob Brogan, Smithsonian, 19 May 2017
Jacob Brogan, Smithsonian, 19 May 2017 Word History
First Known Use
1708, in the meaning defined above
Medical Definition
horn fly
noun
: a small black European dipteran fly (Haematobia irritans of the family Muscidae) that has been introduced into North America where it is a bloodsucking pest of cattle
called also cattle fly
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