adjective
relating to or involving both lips, such as the sounds made by bringing both lips together
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The phoneme /p/ is a bilabial sound produced by bringing both lips together.
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When you say 'pop', notice how your lips come together for the bilabial sound.
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I love how the beatboxer can make those cool bilabial sounds with his lips.
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The artist's painting had a bilabial quality to it, with the colors blending seamlessly like lips coming together.