argininosuccinic acid

[är′jə-nĭ-nō-sək-sĭnĭk, är′jə-nē′-]
n.
  1. An acid formed as an intermediate during the urea cycle in a reaction involving aspartic acid and adenosine triphosphate.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.