the lips (مَخْرَجُ الشَّفَتَين)
علوم القرآن
التعريف :
Here are two places of articulation: 1) bilabial, where the w sound is articulated with open lips, the m sound with closed lips and the b sound with closed lips and plosion; and 2) labiodental, which is the place of articulation of the f sound.