To combine with nitrogen; to add nitrogen to a substance or to treat a compound so it incorporates or becomes enriched with nitrogen.
From azote (nitrogen) + -ise (British spelling of -ize, meaning 'to make or become'). This verb was particularly common in 19th-century agricultural and chemical literature when nitrogen fixation became understood.
Azotise describes exactly what nitrogen-fixing bacteria do in soil—they take nitrogen from the air and convert it into forms plants can use, a process that's literally making the Earth more fertile.
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