labials, Dentals, Linguals, and Palatals.
"1001 Questions and Answers on Orthography and Reading"
B. A. Hathaway
84. What are labials?
"1001 Questions and Answers on Orthography and Reading"
B. A. Hathaway
Baron La Hontan, who spent several years among the Indians, noticed the remarkable fact concerning their language that it had no labials.
"The Falls of Niagara and Other Famous Cataracts"
George W. Holley