: 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
Truly fortunate visitors might be able to catch a glimpse of one of Chile’s elusive mammals, with potential sightings spanning from the culpeo—a small, fox-like canine that thrives in mountainous environments—to the pudú, the earth’s smallest extant species of deer.
—
Jared Ranahan, Forbes, 7 Jan. 2025
According to safety data sheet information, the compounds in the spray are non-toxic to bees, birds, mammals, and fish, and appear to be biodegradable, albeit slowly.
—Miri Talabac, Baltimore Sun, 2 Jan. 2025
While avian influenza primarily affects wild and domestic birds, some strains have the potential to infect mammals, including pets, under certain conditions.
—David Faris, Newsweek, 27 Dec. 2024
These new species include small mammals, birds, insects, fish, reptiles, flowers, and fungi.
—Monica Cull, Discover Magazine, 25 Dec. 2024
See all Example Sentences for mammal 
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Jared Ranahan, Forbes, 7 Jan. 2025
According to safety data sheet information, the compounds in the spray are non-toxic to bees, birds, mammals, and fish, and appear to be biodegradable, albeit slowly.
—Miri Talabac, Baltimore Sun, 2 Jan. 2025
While avian influenza primarily affects wild and domestic birds, some strains have the potential to infect mammals, including pets, under certain conditions.
—David Faris, Newsweek, 27 Dec. 2024
These new species include small mammals, birds, insects, fish, reptiles, flowers, and fungi.
—Monica Cull, Discover Magazine, 25 Dec. 2024
See all Example Sentences for mammal
Dictionary Entries Near mammal
Cite this Entry
“Mammal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mammal. Accessed 18 Jan. 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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