Sentence:  Skyr is a product made of curdled <WSD>milk</WSD>. 
Meaning of the word marked with <WSD> tags:  A white liquid produced by the mammary glands of female mammals to nourish their young. From certain animals, especially cows, it is also called dairy milk and is a common food for humans as a beverage or used to produce various dairy products such as butter, cheese, and yogurt.