methylmalonic aciduria

[mĕth′əl-mə-lōnĭk, -lŏnik]

n.

A metabolic disorder resulting from an enzyme deficiency and characterized by the presence of excessive amounts of methylmalonic acid in the urine; it can be congenital or acquired because of a vitamin B12 deficiency.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.