the state or condition of being rancid, often referring to fats or oils that have spoiled

सड़न की अवस्था

English Usage: After a few weeks, the rancidity of the oil was noticeable by its foul smell.

Hindi Usage: कुछ हफ्तों बाद, तेल की सड़न उसकी बदबू से स्पष्ट थी।