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adjective
1Of a container: having a small mouth or opening.
2Of an animal: having a narrow mouth. Chiefly in "narrow-mouthed toad" noun any of various toads of the family Microhylidae, especially of the American genus Gastrophryne and the Asian genus Microhyla.
Origin
Mid 16th century; earliest use found in Thomas Hill (b. c1528). From narrow + mouthed.
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