informant

(in fôrmənt)

noun

a person who gives, or serves as a source of, information; specif.,
  1. a native speaker of a language whose pronunciations, usages, etc. are studied and recorded by linguists
  2. informer

Origin: < L informans, prp. of informare, to inform

See informant in American Heritage Dictionary 4

noun
  1. a. One that gives information.
    b. One who informs against others; an informer.
  2. One who furnishes linguistic or cultural information to a researcher.

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