Any of a series of alloys containing nickel, iron, and cobalt which have an approximately constant magnetic permeability over a range of field strengths.
Origin
1920s; earliest use found in The Official Gazette. From perm- + invar-.
Definition of perminvar in US English:
perminvar
nounˈpəːmɪnvɑː
Any of a series of alloys containing nickel, iron, and cobalt which have an approximately constant magnetic permeability over a range of field strengths.
Origin
1920s; earliest use found in The Official Gazette. From perm- + invar-.