口こう腔くう鏡きょうMeanings1nounstomatoscope; oral mirrormedicineMedical instrument used to examine the inside of the mouth; domain-specific term.歯し科か医いは口こう腔くう鏡きょうを使つかって虫むし歯ばを確かく認にんした。The dentist used a stomatoscope to check for cavities.