| 1. | Craniometry. (of the skull) the ratio of the distance from nasion to the lower margin of the nasal aperture to that of the maximum breadth of the nasal aperture. |
| 2. | Cephalometry. (of the head) the ratio of the maximum breadth of the external nose to its height from the nasal root to where the septum is confluent with the upper lip. |
| nasal index n. The ratio of the width to the height of the nose, multiplied by 100, used in anthropological measurements. |
