Definition of "tartness" [tart•ness]

• The characteristic of being tart; sharpness of taste; sourness; bitterness. (noun)

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• "I find that a lot of their tartness is lost when you use bottled juice, so make sure to pick up some fresh fruit to juice to make this loaf."
• "I love acidity in white wines, but the malic acid, just-bite-into-an-underripe-green apple tartness is too much here, throwing the wine off balance."
• "To be honest, I prefer plain, straight-up cheesecake ... maybe with a touch of lemon or vanilla, and some tartness from the dairy used."