I. “+ adjective
Etymology: hy- + mandibular
: of or derived from the hyoid arch and mandible ; specifically : being or relating to the dorsal segment of the hyoid arch
II. noun
( -s )
: a bone or cartilage derived from the dorsal hyoid arch, being part of the articulating mechanism of the lower jaw in fishes, and forming the columella or stapes of the ear of higher vertebrates