something used as a coloring matter; pigment; dye.

1880–85; < French, present participle of colorer < Latin colōrāre to color. See color, -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colorant (ˈkʌlərənt)
any substance that imparts colour, such as a pigment, dye, or ink; colouring matter

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The colorant must have preferential affinity for cyanoacrylate.
The colorant must also have a similar thermal parameter to the cyanoacrylate.
Radish antho cyanin extract as a natural red colorant for maraschino cherries.
The product is known to be used for industrial colorant for concrete.
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