underjet

un·der·jet

(ŭndĕr-jet)

Partial overlay of the maxillary and mandibular incisors; maxillary incisors are within the perimeter of the mandibular incisors.
See also: underbite

underjet,

n a malocclusion describing the positional relationship between the maxillary and mandibular incisors in which the maxillary incisors are measurably within the perimeter of the mandibular incisors.