- informant (n.)
[informant 词源字典]
- 1660s, "someone or something that supplies information," from Latin informantem (nominative informans), present participle of informare (see inform). Meaning "one who gives information to the authorities, informer" is from 1783. As an adjective from 1890. The older noun was informer.[informant etymology, informant origin, 英语词源]