Definitions
Cobalt oxide obtained by roasting cobalt ore, used as a blue pigment.
Word origin
From Italian zaffera, from Latin sapphirus (“sapphire”). Doublet of sapphire.
Used in a sentence
“If Zaffre or Regulus of Cobalt be dissolved in the same manner in spirit of nitre, or aqua fortis, a reddish colour is produced on exposing the paper to heat.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Cobalt oxide”6 letters
Not quite right?
"Search similar patterns."
Z_____