Informer
Pronunciation : In*form"er
Part of Speech : n.
Etymology : [From Inform,v.]
Definition : 1. One who informs, animates, or inspires. [Obs.] Thomson. Nature, informer of the poet's art. Pope.
2. One who informs, or imparts knowledge or news.
3. (Law)
Defn: One who informs a magistrate of violations of law; one who informs against another for violation of some law or penal statute. Common informer (Law), one who habitually gives information of the violation of penal statutes, with a view to a prosecution therefor. Bouvier. Wharton.
Source : Webster's Unabridged Dictionary, 1913