English dictionary potassium nitrate meaning and definition Definition and meaning of potassium nitrate at MeaningMonkey.org. potassium nitrate meaning and definition in the English Dictionary. POTASSIUM NITRATE nounDefinition of potassium nitrate (noun)(KNO3) used especially as a fertilizer and explosivesynonyms: niter, nitre, saltpeter, saltpetre Source: Princeton University Wordnet
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