Shibboleth

shib′bō-leth, n. ( B. ) a test-word used by the Gileadites under Jephthah to detect the fleeing Ephraimites, who could not pronounce the sh (Judges, xii. 4-6): the criterion or watchword of a party. [Heb., an ear of corn, or a stream.] IMG:c345_50px_Chambers_1908_Shield.png_utm_source_en.wiki source.org_utm_campaign_parser_utm_content_thumbnail:Chambers_1908_Shield.png-250px-Chambers_1908_Shield.png?utm_source=en.wiki source.org _campaign=parser _content=thumbnail