gnathism the condition of having an upper jaw that protrudes beyond the plane of the face. —gnathic, adj. hiation Obsolete, the act of gaping or letting the mouth hang open wide. lineament a feature or detail in relation to outline or contour, as a feature of a face. —lineamental, adj. mesognathism the condition of having medium-sized jaws that project only slightly from the plane of the face. —mesognathic, mesognathous, adj. metopomancy Rare. a form of divination involving examination of facial features. —metopomantic, adj. metoposcopy the art or science of physiognomy; the attempt to discern a person’s character from the study of the facial features. —metoposcopist, n., —metoposcopic, metoposcopical, adj. opisthognathism the condition of having retracted jaws. —opisthognathic, opisthognathous, adj. orthognathism the condition of having straight jaws. —orthognathic, orthog-nathous, adj. pathognomy the study of the signs that reveal human passions. —pathognomonic, adj. physiognomy 1. the art of determining character or personal qualities from the features or form of the body, especially the face. 2. divination by examining the features of a face. —physiognomist, n. —physiognomic, physiognomical, adj. prognathism the condition of having jaws that project beyond the upper part of the face. —prognathic, prognathous, adj. prosopalgia neuralgia affecting the face. prosopography 1. Obsolete, a description of the face. See also history.
- plural form of facial feature