n., pl., -mas, or -ma·ta (-mə-tə).
A hereditary malignant tumor of the retina, transmitted as a dominant trait and occurring chiefly among infants.
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.
