brachygnathism means an underbite caused by a shortening of the upper mandible (in animals). Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From brachy- + -gnathism.
noun
- An underbite caused by a shortening of the upper mandible (in animals)“None of the lambs had malformation evocative of SBV infection (arthrogryposis-hydranencephaly syndrome, stiff neck, scoliosis, brachygnathism).”