invar n an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments Synonym(s) Invar
News & Articles invar Indian T-90s Get 5,000 Meter Reach September 4, 2013: India recently revealed that it had negotiated a manufacturing license to build 15,000 Russian Invar anti-tank missiles in India where they are used by T-90 tanks. Sept. 4, 2013 - Strategy Page