Webster's English Dictionary

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labium

la.bi.um \'la--be--*m\ \-*\ n or la.bia [NL, fr. L, lip - more at LIP] pl  
   1: any of the folds at the margin of the vulva  2: the lower lip of a 
   labiate corolla  3a: the lower lip of an insect that is formed by the 
   second pair of maxilla e united in the middle line 3b: a liplike part of 
   various invertebrates