Know how to use "fewer" and "less"? Find out.
1848, originally of substances to quell the odor of manure, formed in English as if from de- + Latin odorem "smell" (see odor (n.)). In reference to a substance to be used on the human body, from 1860. An earlier version, a perfumed powder, was called empasm (1650s), from Greek *empasma "to sprinkle on."
deodorant de·o·dor·ant (dē-ō'dər-ənt)
An agent that masks, suppresses, or neutralizes odors, especially a cosmetic applied to the skin to mask body odors. adj.
Capable of masking, suppressing, or neutralizing odors.