Search Result for "trisomy": 
Wordnet 3.0

NOUN (1)

1. chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell; 



WordNet (r) 3.0 (2006):

trisomy
    n 1: chrosomal abnormality in which there is one more than the
         normal number of chromosomes in a cell