: any of numerous small horseflies (as of the genus Chrysops) that include important vectors of tularemia
Cite this Entry
“Deerfly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.grautoblog.com/dictionary/deerfly. Accessed 1 May. 2026.
Copy CitationMedical Definition
deerfly
noun
deer·fly ˈdi(ə)r-ˌflī 
plural deerflies
: any of numerous small horseflies especially of the genus Chrysops that include important vectors of tularemia
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