A winetasting term for wine that has a sharp, pungent taste, as if you've bitten into an under-ripe grape. Tartness is caused by a high level of acidity (in fact, it's a synonym for "acidity"). It's generally used in a negative fashion (as in "This wine is way too tart for me."), unless the winemaker intended to create a lively, tart wine. See also acid.