The Collaborative International Dictionary
Sandix
Sandix \San"dix\, n. [L. sandix, sandyx, vermilion, or a color like vermilion, Gr. ?, ?.] A kind of minium, or red lead, made by calcining carbonate of lead, but inferior to true minium. [Written also sandyx.]
Wiktionary
sandix
n. (context obsolete English) A kind of minium, or red lead, made by calcine carbonate of lead, but inferior to true minium.