Definition of "retinoblastoma" [retinoblastoma]

• A hereditary malignant tumor of the retina, transmitted as a dominant trait and occurring chiefly among infants. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The average age of children with retinoblastoma is 18 months — and boys and girls are affected equally."
• "A major goal of treatment in children with retinoblastoma is preserving vision."
• "The diagnosis of retinoblastoma is made by examining the eyes."