Search Result for "ferromagnetism": 
Wordnet 3.0

NOUN (1)

1. phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed; 



WordNet (r) 3.0 (2006):

ferromagnetism
    n 1: phenomenon exhibited by materials like iron (nickel or
         cobalt) that become magnetized in a magnetic field and
         retain their magnetism when the field is removed