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ringent

adjective
rin·​gent | \ˈrinjənt\

Definition of ringent 

1 : having the lips widely separated and gaping like an open mouth ringent corolla

2 : gaping irregularly the ringent valves of various bivalves

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History and Etymology for ringent

Latin ringent-, ringens, present participle of ringi to open the mouth, show the teeth

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