Definition of "tarter" [tarter]

• Comparative form of tart: more tart (adjective)

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• "Any kind of tarter control toothpaste does it, too."
• "The tarter an apple is, the higher its Vitamin C content."
• "I wondered if maybe it was also a result of the inconsistency of blueberries -- maybe the recipe was written with tarter blueberries in mind (Longbotham does suggest subbing in 1 cup of dried blueberries if good fresh ones are not to be had)."