In*du"sial (?), a. [See Indusium.]
Of, pertaining to, or containing, the petrified cases of the larvae of certain insects.
Indusial limestone Geol., 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.
© Webster 1913.