TARTAREOUS
Etymology
Adjective
tartareous (comparative more tartareous, superlative most tartareous)
Consisting of tartar; of the nature of tartar.
(botany) Having a rough, crumbly surface.
Source: Wiktionary
Tar*ta"re*an, Tar*ta"re*ous, a. Etym: [L. tartareus: cf. F.
tartaréen.]
Definition: Of or pertaining to Tartarus; hellish.
Tar*ta"re*ous, a. Etym: [Cf. 1st Tartarous.]
1. Consisting of tartar; of the nature of tartar.
2. (Bot.)
Definition: Having the surface rough and crumbling; as, many lichens are
tartareous.
Source: Webster’s Unabridged Dictionary 1913 Edition