Webster’s Revised Unabridged Dictionary · 1913
Mandibular
Man·dib′u·lar (măn·dĭb′ū·lẽr), a. [Cf. F. mandibulaire.] Of or pertaining to a mandible; like a mandible. — n. The principal mandibular bone; the mandible.
Mandibular arch (Anat.), the most anterior visceral arch, — that in which the mandible is developed.