Search Result for "retinoblastoma": 
Wordnet 3.0

NOUN (1)

1. malignant ocular tumor of retinal cells; usually occurs before the third year of life; composed of primitive small round retinal cells; 



WordNet (r) 3.0 (2006):

retinoblastoma
    n 1: malignant ocular tumor of retinal cells; usually occurs
         before the third year of life; composed of primitive small
         round retinal cells