Pronunciation (US) IPA (key): /tɑrt/ (UK) IPA (key): /tɑːt/ Audio (AU)(file) Noun Singular tart Plural tarts (countable) A tart is a food like a small pie, usually with a fruit inside it. We ate a strawberry tart for breakfast. (slang) A tart is a woman who does a lot of flirting, often used derogatorily. I think she's a real tart. (slang) A tart is a prostitute. Adjective Positive tart Comparative none Superlative none When something is tart, it has an acidic taste to it. Synonym: sour The lemonade was too tart to drink. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads