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Definitions from the Web

Protheria

Definition:

Protheria is a subclass of egg-laying mammals, including the monotremes.

Senses/Usages:

1. Noun: Referring to the subclass of egg-laying mammals.
• Example Sentence 1: The protheria, such as platypus and echidnas, are unique mammals that lay eggs instead of giving birth to live young.
• Example Sentence 2: Evolutionarily, protheria represents one of the oldest lineages of mammals.
2. Adjective: Describing characteristics related to protheria.
• Example Sentence 1: The protherian reproductive system is distinct from that of placental mammals.
• Example Sentence 2: The platypus exhibits protherian features such as a leathery eggshell.

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