
1) Cover 2) Covering 3) Natural covering
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https://www.crosswordclues.com/clue/indusial

• (a.) Of, pertaining to, or containing, the petrified cases of the larvae of certain insects.
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http://thinkexist.com/dictionary/meaning/indusial/

Of, pertaining to, or containing, the petrified cases of the larvae of certain insects. ... <geology> Indusial limestone, a fresh water limestone, largely composed of the agglomerated cases of caddice worms, or larvae of caddice flies (Phryganea). It is found in Miocene strata of Auvergne, France, and some other localities. ... See: Indusium....
Found on
http://www.encyclo.co.uk/local/20973
In·du'sial adjective [ See
Indusium .] Of, pertaining to, or containing, the petrified cases of the larvæ of certain insects.
Indusial limestone (Geol.) ,
a fresh- water limestone, largely composed of the agglomerated cases of caddice worms, or larvæ of caddice flies ( Ph...
Found on http://www.encyclo.co.uk/webster/I/48
adjective of or relating to or being an indusium
Found on https://www.encyclo.co.uk/local/20974
No exact match found.