Webster's English Dictionary

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labial

1. la.bi.al \'la--be--*l\ \-*-le-\ aj 1: of or relating to the lips or 
   labia  2: giving its tones from impact of an air current on a lip {a ~ in 
   strument} 3: uttered with the participation of one or both lips {the ~ 
   sound s /f/, /p/, and /u:/} - la.bi.al.ly av
2. labial n 1: FLUE PIPE  2: a labial consonant