Bi means two and labial means lips. Bilabial means two-lips. The sound is made by stopping air between the two lips of the mouth and then suddenly releasing it.
The Bilabial Plosive is covered in Part 1 of Lesson 1.
The following diagram shows where the Bilabial Plosive is made in the mouth.
The Bilabial Plosive is used in the following sounds:
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