noun
: any of numerous beetles of the family Gyrinidae that have a firm oval usually dark body with a bronzy luster and that live mostly on the surface of water where they move swiftly about in curves
noun
: any of numerous beetles of the family Gyrinidae that have a firm oval usually dark body with a bronzy luster and that live mostly on the surface of water where they move swiftly about in curves
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012