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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Merriam-Webster unabridged
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