{ } a. [ L. tartareus: cf. F. tartaréen. ] Of or pertaining to Tartarus; hellish. [ 1913 Webster ]

a. [ Cf. 1st Tartarous. ] 1. Consisting of tartar; of the nature of tartar. [ 1913 Webster ]

2. (Bot.) Having the surface rough and crumbling; as, many lichens are tartareous. [ 1913 Webster ]