: any of a class (Mammalia) of warm-blooded higher vertebrates (such as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans
mammal-like
adjective
or less commonly mammallike
mammal-like behavior
mammallike reptiles
Examples of mammal in a Sentence
Human beings, dogs, and cats are all mammals.
Recent Examples on the Web
Near an agricultural area in western India, a scaly mammal went about its night, likely searching for food or water.
—
Aspen Pflughoeft, Miami Herald, 29 May 2025
The mammals are off-limits under the Marine Mammal Protection Act.
—Dennis Romero, NBC news, 25 May 2025
This mammal was witty, a dapper dresser, and a great dancer.
—David Fear, Rolling Stone, 24 May 2025
Heart rate rises, breath softens, and eyes glue to this magnificent 500-pound mammal that could rip me to pieces with the simple swipe of its striped paw.
—Nicole Kliest, Vogue, 23 May 2025
See All Example Sentences for mammal
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Aspen Pflughoeft, Miami Herald, 29 May 2025
The mammals are off-limits under the Marine Mammal Protection Act.
—Dennis Romero, NBC news, 25 May 2025
This mammal was witty, a dapper dresser, and a great dancer.
—David Fear, Rolling Stone, 24 May 2025
Heart rate rises, breath softens, and eyes glue to this magnificent 500-pound mammal that could rip me to pieces with the simple swipe of its striped paw.
—Nicole Kliest, Vogue, 23 May 2025
See All Example Sentences for mammal
Cite this Entry
“Mammal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mammal. Accessed 4 Jun. 2025.
Copy CitationKids Definition
mammal
noun
mam·mal
ˈmam-əl 
: any of a class of warm-blooded vertebrates that include human beings and all other animals that nourish their young with milk produced by mammary glands and have the skin usually more or less covered with hair
Medical Definition
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