protomammal
pro·to·mam·mal
noun
1.
probably warm-blooded; considered direct ancestor of mammals
Origin
From proto- + mammal.
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Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.