Wordnet 3.0
NOUN (1)
1. 
 a heavy ductile magnetic metallic element; 
 is silver-white in pure form but readily rusts; 
 used in construction and tools and armament; 
 plays a role in the transport of oxygen by the blood; 
[syn: iron, Fe, atomic number 26]
WordNet (r) 3.0 (2006):
atomic number 26
    n 1: a heavy ductile magnetic metallic element; is silver-white
         in pure form but readily rusts; used in construction and
         tools and armament; plays a role in the transport of oxygen
         by the blood [syn: iron, Fe, atomic number 26]