Etymology
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disinfectant (n.)

"agent used for destroying the germs of infectious diseases," 1837, from French désinfectant (1816), noun use of present participle of désinfecter (see disinfect), or else from the adjective in English (by 1827), "serving to disinfect." Related: Disinfection.

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Definitions of disinfectant
1
disinfectant (n.)
an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease;
Synonyms: germicide / antimicrobic / antimicrobial
2
disinfectant (adj.)
preventing infection by inhibiting the growth or action of microorganisms;
Synonyms: bactericidal / germicidal
From wordnet.princeton.edu