Tartareous

{ Tar*ta"re*an (?), Tar*ta"re*ous (?), } a. [L. tartareus: cf. F. tartaréen.] Of or pertaining to Tartarus; hellish.

Tar*ta"re*ous, a. [Cf. 1st Tartarous.] 1. Consisting of tartar; of the nature of tartar.

2. (Bot.) Having the surface rough and crumbling; as, many lichens are tartareous.