nonmammalian

adjective
non·​mam·​ma·​li·​an | \ˌnän-mə-ˈmā-lē-ən, -ma-\

Definition of nonmammalian 

: not of, relating to, or being a mammal : not mammalian … the bones … that connect the lower jaw to the skull in nonmammalian vertebrates.— James Hanken

First Known Use of nonmammalian

1880, in the meaning defined above

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The first known use of nonmammalian was in 1880

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