plural noun
Pro·ar·thri | \ prōˈärˌthrī \

Definition of Proarthri 

in some classifications

: a suborder of Cestraciontes that includes the Heterodontidae and related forms having the palatoquadrate apparatus articulated with the preorbital part of the skull

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History and Etymology for Proarthri

New Latin, from pro- entry 1 + -arthri (from Greek arthron joint)

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occurring twice a year or every two years

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