noun
or mar·fan's syndrome ¦märˌfan-
Usage: usually capitalized M
Etymology: after Antonin Bernard Jean Marfan died 1942 French pediatrician
: a disorder of connective tissue that is inherited as a dominant trait, is caused by a defect in the gene controlling the production of a protein in connective tissue, and is characterized by abnormal elongation of the long bones and often by ocular and circulatory defects