Search Result for "invar": 
Wordnet 3.0

NOUN (1)

1. an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments; 



WordNet (r) 3.0 (2006):

Invar
    n 1: an alloy of iron and nickel having a low coefficient of
         thermal expansion; used in tuning forks and measuring tapes
         and other instruments