(1 syl.). The sacred stone of the Caaba (q.v.) is, according to Arab tradition, the guardian angel of Paradise turned into stone. When first built by Abraham into the wall of the shrine it was clear as crystal, but it has become black from being kissed by sinful man.
Leave no stone unturned. Omit no minutiae if you would succeed. After the defeat of Mardonius at Platæa (B.C. 477), a report was current that the Persian General had left great treasures in his tent. Polycrates (4 syl.) the Theban sought long but found them not. The Oracle of Delphi, being consulted, told him “to leave no stone unturned,” and the treasures were discovered.