Tar-tā're-ōus, a.
a. [Fr. tartareux, It. & Sp. tartareo.]
Sense 1. Consisting of tartar; resembling tartar, or partaking of its properties.
Sense 2. Of, or pertaining to, Tartarus; Tartarean.
Sense 3. (Bot.) Having the surface rough and crumbling, as in many lichens.