monotreme
1.
(
noun
) the most primitive mammals comprising the only extant members of the subclass Prototheria
Synonyms:
egg-laying mammal
Related Words:
Ornithorhynchus anatinus
,
anteater
,
duck-billed platypus
,
duckbill
,
duckbilled platypus
,
echidna
,
platypus
,
prototherian
,
spiny anteater
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