quadrants definition
quadrant. Definitions: 1. One quarter of a circle. 2. anatomy roughly circular areas are divided for descriptive purposes into quadrants. The abdomen is divided into right upper and lower and left upper and lower quadrants by a horizontal and a vertical line intersecting at the umbilicus.uadrant. Definitions: 1. One quarter of a circle. 2. anatomy roughly circular areas are divided for descriptive purposes into quadrants. The abdomen is divided into right upper and lower and left upper and lower quadrants by a horizontal and a vertical line intersecting at the umbilicus.