whey

the serum or watery part of milk that is separated from the curd in making cheese

दही को मथ कर मक्खन निकाल कर लस्सी बनती है जो स्वास्थ्य के लिए अति गुणकारी है. Whey is prepared by churning the curd and by removing butter from it and whey is very useful for health.

Little Miss Muffet sat on a tuffet eating some curds and whey