Illustration of flea
: any of an order (Siphonaptera) of small wingless bloodsucking insects that have a hard laterally compressed body and legs adapted to leaping and that feed on warm-blooded animals
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Examples of flea in a Sentence
Recent Examples on the Web
William Bendix wouldn’t have hurt a flea.
—
Richard E. Vatz, Baltimore Sun, 15 June 2026
Nitenpyram was previously approved by the FDA in 2000, under the brand name Capstar, for treating fleas.
—Aimee Picchi, CBS News, 12 June 2026
The cases are in cattle, goats and a dog in Texas and New Mexico, according to the Department of Agriculture, and the FDA on Thursday approved the use of generic Nitenpyram tablets—an oral treatment usually used to kill fleas—in dogs, puppies, cats and kittens infected with screwworm.
—Mary Whitfill Roeloffs, Forbes.com, 11 June 2026
The adults will jump off, like a flea, when plants are disturbed.
—Arricca Elin Sansone, Southern Living, 10 June 2026
See All Example Sentences for flea
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Richard E. Vatz, Baltimore Sun, 15 June 2026
Nitenpyram was previously approved by the FDA in 2000, under the brand name Capstar, for treating fleas.
—Aimee Picchi, CBS News, 12 June 2026
The cases are in cattle, goats and a dog in Texas and New Mexico, according to the Department of Agriculture, and the FDA on Thursday approved the use of generic Nitenpyram tablets—an oral treatment usually used to kill fleas—in dogs, puppies, cats and kittens infected with screwworm.
—Mary Whitfill Roeloffs, Forbes.com, 11 June 2026
The adults will jump off, like a flea, when plants are disturbed.
—Arricca Elin Sansone, Southern Living, 10 June 2026
See All Example Sentences for flea
Cite this Entry
“Flea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flea. Accessed 20 Jun. 2026.
Copy CitationKids Definition
flea
noun
: any of an order of small wingless bloodsucking insects with a hard body and legs used for leaping
Medical Definition
flea
noun
: any of the order Siphonaptera comprising wingless bloodsucking insects that have a hard laterally compressed body and legs adapted to leaping and that feed on warm-blooded animals see cat flea, chigoe sense 1, dog flea, rat flea, sand flea, sticktight flea
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