IPA: /ˈtɑːrtɪst/
KK: /tɑrtɪst/
The most sharp or sour in taste, often used to describe food or flavors that have a strong acidic quality.
The tartest lemon I have ever tasted was used in the pie.
Comparative: tarter
Superlative: tartest
The word 'tartest' is derived from 'tart' (from Old French *tart*, meaning sharp or sour) and the superlative suffix '-est' (meaning most). Therefore, 'tartest' refers to something that is the most sharp or sour in taste.
Think of 'tart' meaning sharp or sour, and remember that 'tartest' describes something that is the most sharp or sour.