impervium
/ɪmˈpəːvɪəm/Originally and chiefly Science Fiction
noun
A virtually impenetrable or indestructible substance.
- Frequently (and earliest) in attributive use..
Origin
1930s. From imperv- + -ium.
- civilian
- civilian casualty
- civilianise
- civilianism
- civilianization
- civilianize
- civilian target
- civilian–military
- civilisade
- civilisation
- civilise
- civilist
- civility
- civilizable
- civilizade
- civilization
- civilizational
- civilizatory
- civilize
- civilizedness
- civilizee
- civilizer
- civil law
- civil libertarian
- civil liberty