prototheria

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Definitions from WordNet

Noun prototheria has 1 sense

Prototheria, subclass Prototheria - echidnas; platypus
--₁ is a kind of class
--₁ is a member of Mammalia, class Mammalia
--₁ has members: Monotremata, order Monotremata

Definitions from the Web

Prototheria

Noun: Prototheria refers to a sub-class of mammals that includes the monotremes, the most primitive group of living mammals.

Sample sentence: The platypus and echidnas are examples of prototheria, which are known for laying eggs instead of giving birth to live young.

Adjective: When used as an adjective, prototheria describes something relating to or characteristic of the subclass Prototheria.

Sample sentence: The prototherian reproductive system is unique among mammals.

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