Dictionary

informer

noun in·form·er \in-ˈfr-mər\

: a person who gives information to the police about secret or criminal activities

Full Definition of INFORMER

1
:  one that imparts knowledge or news
2
:  one that informs against another; specifically :  one who makes a practice especially for a financial reward of informing against others for violations of penal laws
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First Known Use of INFORMER

14th century

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