WordNet
n. butter made from yaks' milk
Wikipedia
Yak butter is butter made from the milk of the domesticated yak (Bos grunniens). It is a staple food item and trade item for herding communities in south Central Asia and the Tibetan Plateau. Many different political entities have communities of herders who produce and consume yak's dairy products including cheese and butter – for example, China, India, Mongolia, Nepal, and Tibet.
Whole yak's milk has about twice the fat content of whole cow's milk, producing a butter with a texture closer to cheese.
Usage examples of "yak butter".
For instance, there was a box holding a churn, lumps of yak butter, and tea leaves.
Sweeper dropped a lump of rancid yak butter in the tea bowl beside him.
He smelled mutton cooking, and the acrid, unpleasant odor he had learned to identify with yak butter.
He had tried it on the trail, because he was interested in everything, even yak butter.
A cup of tea'll shift him, with rancid yak butter for preference you should be able to get some at any good Bard .