萤火虫几种夜间活动的萤科昆虫中的任意一种，明显的特征是腹部的后端内有发冷光的物质，能产生闪烁的亮光。
Any of various nocturnal beetles of the family lampyridae , characteristically having luminescent chemicals in the posterior tip of the abdomen that produce a flashing light .
萤科