variable region: Meaning and Definition of

var'iable re"gion

Pronunciation: [key]
— Immunol. Immunol.
  1. a configuration in the upper branches of theof an antibody molecule, unique in each antibody type, that binds with the determinant of a specific antigen.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.