b

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}. [1913 Webster]

2. (Mus.) An organ pipe that is furnished with lips; a flue pipe. [1913 Webster]

3. (Zo["o]l.) One of the scales which border the mouth of a fish or reptile. [1913 Webster]