disinfectant
n.
1837, from French désinfectant (1816), noun use of present participle of désinfecter (see disinfect). From 1875 as an adjective.
〔李〕[disinfect v. 给⋯消毒；-ant ⇒“a thing that disin-fects给⋯消毒的东西”→] n. a substance used to destroy dis-ease germs消毒剂