Zaffer
Definitions
1
ZAF'FER , noun The residuum of cobalt, after the sulphur, arsenic and other volatile matters have been expelled by calcination; so that it is a gray or dark gray oxyd of cobalt, mixed with a portion of silex.
Source: American Dictionary of the English Language (1828 Edition), MDX derived from public Internet Archive item. Private-use review; confirm rights before public redistribution