Trigeminal cavity

What is Trigeminal cavity?

Trigeminal cavity definition and meaning on Dictionary terms:
noun
any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened, oval body varying in length from 1 inch (2.5 cm) or less to 2 feet (61 cm).

 

reference: https://www.dictionary.com/browse/trigeminal-cavity

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