tartareous

Consisting of tartar; of the nature of tartar.

His brooding wings the Spirit of God outspread, / And vital virtue infused and vital warmth, / Throughout the fluid mass, but downward purged / The black, tartareous, cold, infernal, dregs / Adverse to life: then founded, then conglobed / Like things to like.

Having a rough, crumbly surface.

Many lichens are tartareous.

Of or pertaining to Tartarus; hellish.

His brooding wings the Spirit of God outspread, / And vital virtue infused and vital warmth, / Throughout the fluid mass, but downward purged / The black, tartareous, cold, infernal, dregs / Adverse to life: then founded, then conglobed / Like things to like.