Astringent fruit is a type of fruit that has a sour or bitter taste. The term can refer to three different fruits: SLOE (4 letters), Sloes (5 letters), and Blackcurrants (13 letters). SLOE is a small, dark-colored fruit that is related to the plum and is commonly used to make jams and liqueurs. Sloes are similar to SLOE but are larger and have a more intense flavor. Blackcurrants are small, dark purple berries that are often used to make jams, jellies, and syrups.