nitrosoethylureaEtymologyFrom nitroso + ethyl + urea.nitrosoethylurea means A highly potent mutagen with molecular formula C₃H₇N₃O₂. Lexicurio rates it Rare gem — a strength score of 82 out of 100.nounA highly potent mutagen with molecular formula C₃H₇N₃O₂.