the angle formed by the horizontal plane of the head and a line passing from the center of the margin of the alveolar arch of the maxilla, below the nasal spine to the center of the frontonasal suture.
Ranke,Johannes, German anthropologist and physician, 1836-1916.
Ranke angle - a facial angle.
Ran·ke an·gle(rahnkĕ anggĕl)
Area formed by horizontal plane of head and a line passing from center of margin of alveolar arch of maxilla, below nasal spine to center of frontonasal suture.