hyomandibular

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adjective

hyo·​man·​dib·​u·​lar ˌhī-ō-man-ˈdib-yə-lər 

: of or derived from the hyoid arch and mandible

specifically : being or relating to the dorsal segment of the hyoid arch

hyomandibular

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noun

: a bone or cartilage derived from the dorsal hyoid arch that is part of the articulating mechanism of the lower jaw in fishes and forms the columella or stapes of the ear of higher vertebrates