labial

mastery
/ˈleɪ.bi.əl/adjnoun

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Which word is closest in meaning to 'labial' in this sentence?

The motions of the Tongue, Lips, Throat, Palate, &c. which go to the making of the several Alphabetical Letters are worthy inquiry... The Hebrews have been diligent in it, and have assigned which Letters are Labial, which Dental, which Guttural.