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The Collaborative International Dictionary of English v.0.48 (gcide)

Labial \La"bi*al\, a. [LL. labialis, fr. L. labium lip: cf. F.
labial. See {Lip}.]
1. Of or pertaining to the lips or labia; as, labial veins.
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2. (Mus.) Furnished with lips; as, a labial organ pipe.
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3. (Phonetics)
(a) Articulated, as a consonant, mainly by the lips, as b,
p, m, w.
(b) Modified, as a vowel, by contraction of the lip
opening, as [=oo] (f[=oo]d), [=o] ([=o]ld), etc., and
as eu and u in French, and ["o], ["u] in German. See
Guide to Pronunciation, [sect][sect] 11, 178.
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4. (Zool.) Of or pertaining to the labium; as, the labial
palpi of insects. See {Labium}.
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Labial \La"bi*al\, n.
1. (Phonetics) A letter or character representing an
articulation or sound formed or uttered chiefly with the
lips, as {b}, {p}, {w}.
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2. (Mus.) An organ pipe that is furnished with lips; a flue
pipe.
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3. (Zool.) One of the scales which border the mouth of a fish
or reptile.
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