adj.
Having reverted to the normal phenotype, usually by a second mutation: a revertant mutant; revertant cells.
n.
A revertant organism, cell, or strain.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.