Microstomia (micro- a combining form meaning small + -stomia a combining form meaning mouth = (abnormally) `small mouth`) is a clinical feature of many craniofacial syndromes, including Freeman-Sheldon syndrome and Sheldon-Hall syndromes (or distal arthrogryposis multiplex congenita). It may present with whistling-face feature, as well, as in Fr.....
A congenital defect in which the mouth is unusually small. ... (12 Dec 1998) ... 
(mi″kro-sto´me-ә) abnormally decreased size of the mouth.
Type: Term Pronunciation: mī′krō-stō′mē-ă Definitions: 1. Smallness of the oral fissure or opening.