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shibboleth

noun

  1. the test word used by the men of Gilead to distinguish the escaping Ephraimites, who pronounced the initial (s̸h) as (s): Judg. 12:4-6
  2. any test word or password
  3. any phrase, custom, etc. distinctive of a particular party, class, etc.

See shibboleth in American Heritage Dictionary 4

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