Meaning of “mammal” in the English Dictionary

american-english dictionary
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"mammal" in British English

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mammalnoun [ C ]

uk /ˈmæm.əl/ us /ˈmæm.əl/

C1 any animal of which the female feeds her young on milk from her own body. Most mammals give birth to live young, not eggs:

Humans, dogs, elephants, and dolphins are all mammals, but birds, fish, and crocodiles are not.
mammalian
adjective uk /məˈmeɪ.li.ən/ us /məˈmeɪ.li.ən/ specialized

mammalian evolution
mammalian species

(Definition of “mammal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mammal" in American English

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mammalnoun [ C ]

us /ˈmæm·əl/

biology any animal in which the female gives birth to babies, not eggs, and feeds them on milk from her own body

(Definition of “mammal” from the Cambridge Academic Content Dictionary © Cambridge University Press)