fungus gnat

noun

: any of various small dipteran flies (families Mycetophilidae and Sciaridae) resembling mosquitoes and having larvae that feed on fungi and decaying organic matter

Examples of fungus gnat in a Sentence

Recent Examples on the Web
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Consistent moisture can also attract pests like fungus gnats and spider mites, which can quickly kill a plant. Cori Sears, The Spruce, 27 Apr. 2026 This includes fruit flies, the fungus gnats in our potted plants, and those little gnats that like to get in our eyes and noses. Brandee Gruener, Southern Living, 10 Apr. 2026 Cinnamon can also protect plants from ants, fungus gnats, mites, aphids, mosquitoes, fruit flies, and wasps. Michelle Mastro, Martha Stewart, 1 Apr. 2026 Doing this can also kill off any fungus gnats that have made the moist soil their home. Bestreviews, Mercury News, 12 Mar. 2026 See All Example Sentences for fungus gnat

Word History

First Known Use

1862, in the meaning defined above

Time Traveler
The first known use of fungus gnat was in 1862

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Cite this Entry

“Fungus gnat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fungus%20gnat. Accessed 3 May. 2026.

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