LSJ
τά, arsenical sulphides of cobalt, Ps.-Democr.Alch. p. 51 B. (κοβ-), Zos.Alch. p. 188 B. (κωβ-, v.l. κοβ-); — hence κωβαθηκαύστης, ου, ὁ, ΄arsenic-burner΄, applied to Nilus, ib. 191 B. (vv. ll. κωβατικ-, κωβαθιοκ-).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)