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promammal

noun
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pro·​mammal | \ (ˈ)prō+ \

Definition of promammal

1 : an extinct reptile exhibiting definite mammalian characteristics especially : a synapsid reptile
2a : a primitive mammal (as a platypus) not exhibiting all the characteristics of the group
b : one of the Protomammalia

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History and Etymology for promammal

pro- entry 1 + mammal

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“Promammal.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/promammal. Accessed 25 January 2020.

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