nonmammalian

adjective

non·​mam·​ma·​li·​an ˌnän-mə-ˈmā-lē-ən 

-ma-

: 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

Word History

First Known Use

1880, in the meaning defined above