If your goal is to avoid all suspicion of harmful chemicals, than using traditional deodorant or antiperspirant will make that very difficult. The easiest way to keep your body safe and healthy is to avoid entirely all chemical laden deodorants and antiperspirants, and begin using natural deodorants.
Medical Definition of nitro. : containing or being the monovalent group NO2 united through nitrogen.
A nitrous oxide engine is an engine in which the oxygen required for burning the fuel stems from the decomposition of nitrous oxide (N2O) rather than air.