micrognathia
noun
mi·cro·gna·thia
| \ ˌmī-krō-ˈnā-thē-ə
, -ˈnath-ē-ə
, ˌmī-ˌkräg-\
, -ˈnath-ē-ə
, ˌmī-ˌkräg-\
Medical Definition of micrognathia
: abnormal smallness of one or both jaws