mentomeckelian

from The Collaborative International Dictionary of English v.0.48
Mentomeckelian \Men`to*meck*e"li*an\, a. [1st mental +
   Meckelian.] (Anat.)
   Of or pertaining to the chin and lower jaw. -- n. The bone or
   cartilage forming the anterior extremity of the lower jaw in
   some adult animals and the young of others.
   [1913 Webster]
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