maxillo-alveolar index

noun

max·​il·​lo-al·​ve·​o·​lar index mak-ˌsil-(ˌ)ō-al-ˈvē-ə-lər-, ˌmak-sə-(ˌ)lō- 

: the ratio multiplied by 100 of the distance between the most lateral points on the external border of opposite sides of the alveolar arch to its length