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zaffer

or zaf·fre

[zaf-er]
noun
  1. an artificial mixture, resembling smalt, containing cobalt oxide and, usually, silica, used to produce a blue color in glass and in ceramic glazes.
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Origin of zaffer

1655–65; < Italian zaffera, perhaps < Latin sapphīra sapphire
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for zaffre

zaffer

zaffre

noun
  1. impure cobalt oxide, used to impart a blue colour to enamels
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Word Origin

C17: from Italian zaffera; perhaps related to Latin sapphīrus sapphire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012