: 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
The ship will travel on to Antarctica, South Georgia, and the Falkland Islands, providing myriad opportunities to marvel at pristine landscapes; catch sight of marine mammals, penguins, and other rare birdlife; and visit towns that evoke Victorian England.
—
Robb Report Studio, Robb Report, 1 Nov. 2024
Last summer, for example, a red tide bloom released a neurotoxin called domoic acid that sickened sea lions and other marine mammals along the California coast, including in Los Angeles.
—Clara Harter, Los Angeles Times, 30 Oct. 2024
The two bats squared off Thursday as the Bureau of Land Management kicked off round one of its Bat Beauty Contest, which tallies public votes in bat brackets until one mammal flies away with the title.
—Leslie Katz, Forbes, 28 Oct. 2024
Since dolphins are mammals, microplastics may well pose these health risks for them, too.
—Leslie Hart, Discover Magazine, 28 Oct. 2024
See all Example Sentences for mammal 
These examples are automatically compiled from online sources to
illustrate current usage. Opinions expressed in the examples do not represent those of
Merriam-Webster or its editors.
Send us feedback
about these examples.
Robb Report Studio, Robb Report, 1 Nov. 2024
Last summer, for example, a red tide bloom released a neurotoxin called domoic acid that sickened sea lions and other marine mammals along the California coast, including in Los Angeles.
—Clara Harter, Los Angeles Times, 30 Oct. 2024
The two bats squared off Thursday as the Bureau of Land Management kicked off round one of its Bat Beauty Contest, which tallies public votes in bat brackets until one mammal flies away with the title.
—Leslie Katz, Forbes, 28 Oct. 2024
Since dolphins are mammals, microplastics may well pose these health risks for them, too.
—Leslie Hart, Discover Magazine, 28 Oct. 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 16 Nov. 2024.
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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share