mammal

noun

mam·​mal ˈma-məl How to pronounce mammal (audio)
: 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
mammalian adjective or noun
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 higher tides may have even made freshwater less available to small mammals and prompted the frenzy on the cactuses stems to quench their thirst. Dino Grandoni, Washington Post, 13 July 2024 If these mammals are carrying Lyme-causing Borrelia bacteria, the tick is now infected and can transmit the disease. Ashwin Rodrigues, Outside Online, 11 July 2024 There were a few differences, however, including a couple of genes that are known to be involved in hair production in other mammals. John Timmer, Ars Technica, 11 July 2024 The Enquirer's TikTok team headed to the Cincinnati Zoo & Botanical Garden for a meet-and-greet with the zoo's red pandas ‒ the small, reddish-brown mammals that look almost too cute to be real. Grace Tucker, The Enquirer, 10 July 2024 See all Example Sentences for mammal 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mammal.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

from base of New Latin Mammalia (Linnaeus), class name, noun derivative from neuter plural of mammālis, from Latin mamma "breast, udder" + -ālis -al entry 1 — more at mamma entry 1

First Known Use

1811, in the meaning defined above

Time Traveler
The first known use of mammal was in 1811

Dictionary Entries Near mammal

Cite this Entry

“Mammal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mammal. Accessed 23 Jul. 2024.

Kids Definition

mammal

noun
mam·​mal ˈmam-əl How to pronounce mammal (audio)
: 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

mammal

noun
mam·​mal ˈmam-əl How to pronounce mammal (audio)
: any of the higher vertebrate animals comprising the class Mammalia
mammalian adjective or noun

More from Merriam-Webster on mammal

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