yogurt

A custardlike food with a tart flavor, prepared from milk curdled by bacteria, especially Lactobacillus bulgaricus and Streptococcus thermophilus, and often sweetened or flavored.

A milk-based product thickened by a bacterium-aided curdling process, and sometimes mixed with fruit or other flavoring.

Any similar product based on other substances (e.g. soy yogurt).

a custard-like food made from curdled milk