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Y

yam

A large tuber that grows in tropical and subtropical climates; it has starchy pale-yellow flesh. The name “yam” is also used for the botanically unrelated sweet potato.

yeast

Microscopic organism whose metabolic processes are responsible for fermentation. It is used for leavening bread and in the making of beer and wine.

yogurt

Milk cultured with bacteria to give it a slightly thick consistency and sour flavor.