mulibrey nanism /mul″ibrī/ , a rare genetic disorder, transmitted as an autosomal-recessive trait, characterized by dwarfism, constrictive pericarditis, muscular hypotonia, anomalies of the skull and face, and characteristic yellow dots in the ocular fundus. The name of the condition is an abbreviation composed of the first two letters of the anatomical sites of the principal defects: muscle, liver, brain, and eyes.