basilar prognathism

bas·i·lar prog·na·thism

the concave facial profile, or forward position of the chin, resembling mandibular prognathism, created by the prominence of the bone of the mandible at the chin or menton.
Farlex Partner Medical Dictionary © Farlex 2012

bas·i·lar prog·na·thism

(basi-lăr prognă-thizm)
Concave facial profile, or forward position of chin, resembling mandibular prognathism, created by the prominence of mandible at chin or menton.
Medical Dictionary for the Dental Professions © Farlex 2012