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.
- musical statues
- musical theatre
- musical theorist
- musical theory
- musical watch
- musica nortena
- musica norteno
- musica norteña
- musica plana
- music appreciation
- musica reservata
- musicassette
- music band
- music book
- music box
- music case
- music cassette
- music centre
- music club
- music college
- music demy
- music director
- music drama
- music-dramatist
- music festival