Wordnet 3.0
NOUN (1)
1. 
 an organization concerned to preserve historic monuments and buildings and places of historical interest or natural beauty; 
 founded in 1895 and supported by endowment and private subscription; 
[syn: National Trust, NT]
WordNet (r) 3.0 (2006):
National Trust
    n 1: an organization concerned to preserve historic monuments
         and buildings and places of historical interest or natural
         beauty; founded in 1895 and supported by endowment and
         private subscription [syn: National Trust, NT]