/ Dictionary / Index A alpha-fetoprotein: Meaning and Definition of Find definitions for: al•pha-fe•to•pro•tein Pronunciation: (al"fu-fē"tō-prō'tēn, -tē-in), [key] — n. Biochem. a serum protein produced during pregnancy, useful in the prenatal diagnosis of multiple births or birth defects. Abbr.: AFP Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alpha-fetoprotein (Thesaurus) alpha decay alpha globulin Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language