yo·gurt also yo·ghurt 
(yōgərt)
(yōgərt)n.
A custardlike food with a tart flavor, prepared from milk curdled by bacteria, especially Lactobacillus bulgaricus and Streptococcus thermophilus, and often sweetened or flavored.
[Turkish yoǧurt, from Old Turkic yoǧrut.]