tart
Cross references: 1. sour 1. tart \'ta:rt\ aj [ME, fr. OE teart sharp, severe; akin to MHG traz spite] 1: agreeably sharp to the taste : PUNGENT 2: BITING, CAUSTIC - tart.ly av 2. tart n [ME tarte, fr. MF] 1: a small pie or pastry shell containing jelly, custard, or fruit 2: PROSTITUTE