MESORRHINIUM

noun

or meso·rhin·i·um ˌ ̷ ̷ ̷ ̷ˈrinēəm

( plural mesorrhin·ia or mesorhin·ia -ēə)

Etymology: New Latin, from mes- + rhin- + -ium

: the part of the base of the upper mandible of a bird that lies between the nostrils