Rin″gent (?), a. [L. ringens, -entis, p. pr. of ringi to open wide the mouth: cf. F. ringent.] (Bot.) Having the lips widely separated and gaping like an open mouth; as a ringent bilabiate corolla.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.