fetoprotein

[fē′tə-prōtēn]
n.
  1. Any of several antigens normally present in a fetus and occurring abnormally in adults as a result of certain neoplastic conditions or diseases of the liver.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.