An abnormal configuration of the lower lip such that it is turned outward i.e., everted, with the Inner aspect of the lower lip vermilion (normally opposing the teeth) being visible in a frontal view.
Comment:
In frontal view, with the face relaxed, the apparent height of the lower lip vermilion is excessive and the lower incisors may be visible. On profile view, the vermilion is more convex than usual. An everted lower lip may be viewed as pouting, but this designation is a functional term.