: 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
Beyond conservation implications, the rediscovery provides a rare opportunity to study early mammalian evolution and the biological pathways that shaped modern mammals.
—
Kaif Shaikh, Interesting Engineering, 31 Dec. 2025
They have been documented consuming 24 species of mammals and 43 species of birds, as well as alligators.
—Sonia Osorio, Miami Herald, 31 Dec. 2025
After a brief introduction to the anatomy of sea turtles in the region and how the center aims to protect the mammals and marine ecosystems, we were led to a room to watch the majestic creatures during a feeding.
—Kristin Braswell, Condé Nast Traveler, 31 Dec. 2025
Deadline revealed in October that StudioCanal, maker of the Paddington movies, was suing UK producer Avalon for satirizing the marmalade-loving mammal in its iconic puppet sketch show Spitting Image.
—Jake Kanter, Deadline, 27 Dec. 2025
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Kaif Shaikh, Interesting Engineering, 31 Dec. 2025
They have been documented consuming 24 species of mammals and 43 species of birds, as well as alligators.
—Sonia Osorio, Miami Herald, 31 Dec. 2025
After a brief introduction to the anatomy of sea turtles in the region and how the center aims to protect the mammals and marine ecosystems, we were led to a room to watch the majestic creatures during a feeding.
—Kristin Braswell, Condé Nast Traveler, 31 Dec. 2025
Deadline revealed in October that StudioCanal, maker of the Paddington movies, was suing UK producer Avalon for satirizing the marmalade-loving mammal in its iconic puppet sketch show Spitting Image.
—Jake Kanter, Deadline, 27 Dec. 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 3 Jan. 2026.
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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