Microgenia is the medical term for an unusually small or deformed chin. The contrasting condition, an enlarged chin, is called `macrogenia`. ==Causes== Can occur in anyone, but is often a sign of Down`s syndrome. ...[gastropod] Microgenia is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae. Species within the genus Microgenia include: ...
A small or underdeveloped chin.
Abnormal smallness of the chin resulting from the underdevelopment of the mental symphysis. ... Origin: micro-+ G. Geneion, chin ... (05 Mar 2000) ... 
(mi″kro-jen´e-ә) abnormal smallness of the chin.
Type: Term Pronunciation: mī′krō-jēn′ē-ă Definitions: 1. Abnormal smallness of the chin resulting from the underdevelopment of the mental symphysis.
a small or underdeveloped chin.