What is the meaning of tart?

noun

• A woman who engages in sexual intercourse for money.
  • synonyms: prostitute, cocotte, whore, harlot, bawd, cyprian, fancy woman, working girl, sporting lady, lady of pleasure, woman of the street
• A small open pie with a fruit filling.
• A pastry cup with a filling of fruit or custard and no top crust.

adjective

• Tasting sour like a lemon.
  • synonyms: lemony, lemonlike, sourish, tangy
• Harsh.
  • usage: "sharp criticism"; "a sharp-worded exchange"; "a tart remark"
  • synonyms: sharp, sharp-worded