Definition of "bilabial"

bilabial

/baɪ.ˈleɪ.bi.əl/

adjective
not comparable
1. (phonetics) Articulated with both lips.
  Quotations
  "Oh, yes. He talks a lot about phonemes and semantemes and bilabial fricatives. He has a van with recording apparatus in it. He's a good chap."
  1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 545
noun
plural bilabials
1. (phonetics) A speech sound articulated with both lips.