from The Century Dictionary and Cyclopedia
- n. A condition of a horse's mouth in which the upper incisor teeth become long and overlap the lower incisors: seen usually in old horses.
Sorry, no etymologies found.
In the _parrot-mouth_, the wear occurs on the posterior face of the superior and the anterior face of the inferior incisors, the teeth becoming worn to rather a sharp edge, depending on the degree of the deformity.
-- The common deformities of the jaw and teeth are the overshot or parrot-mouth, the undershot or lantern-jaw, and the scissor-mouth.
_ -- There is a deformity, known as parrot-mouth, that interferes with prehension, mastication, and, indirectly, with digestion.
_lantern-jaw_, the wear occurs on the posterior face of the lower and the anterior face of the superior row of incisors, the teeth taking on somewhat the same shape as the parrot-mouth.