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Definition of Egg-laying mammal
1. Noun. The most primitive mammals comprising the only extant members of the subclass Prototheria.
Exact synonyms: Monotreme
Generic synonyms: Prototherian
Specialized synonyms: Anteater, Echidna, Spiny Anteater, Anteater, Echidna, Spiny Anteater, Duck-billed Platypus, Duckbill, Duckbilled Platypus, Ornithorhynchus Anatinus, Platypus
Generic synonyms: Prototherian
Specialized synonyms: Anteater, Echidna, Spiny Anteater, Anteater, Echidna, Spiny Anteater, Duck-billed Platypus, Duckbill, Duckbilled Platypus, Ornithorhynchus Anatinus, Platypus