an elongated fiberoptic endoscope for examining the entire colon from cecum to rectum
colonoscope详细解释
co.lon.o.scope n.（名词）A long, flexible endoscope, often equipped with a device for obtaining tissue samples, that is used for visual examination of the colon.Also called coloscope 结肠镜：一种长的、灵活的内窥镜，通常配备有获取组织样本的构造，用于对结肠的检查也作 coloscope
