: 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
This little isthmus also brims with rainforests and jungles teeming with all manner of beautiful and exotic wildlife—Panama is home to more than 940 species of birds as well as 220 mammals and 354 reptiles and amphibians.
—
Kathleen Peddicord, Forbes, 22 Nov. 2024
The mammal, that gets its name from the fin on its back, near its tail, is found in oceans across the world.
—Saman Shafiq, USA TODAY, 20 Nov. 2024
Humans and other mammals aren't so well equipped to handle those foods.
—Amiah Taylor, Discover Magazine, 13 Nov. 2024
Most mammals, humans included, typically fuel exercise by burning carbohydrates and lipids, neither or which are available in the blood.
—Mack Degeurin, Popular Science, 7 Nov. 2024
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Kathleen Peddicord, Forbes, 22 Nov. 2024
The mammal, that gets its name from the fin on its back, near its tail, is found in oceans across the world.
—Saman Shafiq, USA TODAY, 20 Nov. 2024
Humans and other mammals aren't so well equipped to handle those foods.
—Amiah Taylor, Discover Magazine, 13 Nov. 2024
Most mammals, humans included, typically fuel exercise by burning carbohydrates and lipids, neither or which are available in the blood.
—Mack Degeurin, Popular Science, 7 Nov. 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 1 Dec. 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
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