Wordnet 3.0
NOUN (1)
1. 
 any of several plants of or developed from the species Dahlia pinnata having tuberous roots and showy rayed variously colored flower heads; 
 native to the mountains of Mexico and Central America and Colombia; 
[syn: dahlia, Dahlia pinnata]
WordNet (r) 3.0 (2006):
Dahlia pinnata
    n 1: any of several plants of or developed from the species
         Dahlia pinnata having tuberous roots and showy rayed
         variously colored flower heads; native to the mountains of
         Mexico and Central America and Colombia [syn: dahlia,
         Dahlia pinnata]