[{"Bold_text": "verb (used with object)", "List Items": ["Chemistry, Biology.to oxidize (ammonia, ammonium compounds, or free atmospheric nitrogen) to nitrites and then to nitrates, especially in soil by bacterial or other microbial action.", "Chemistry.to infuse with nitrogen or nitrogen compounds.", "Chemistry.to treat or combine with nitrogen or its compounds.", "Chemistry.(formerly) to convert into niter ."]}]