noun
: a system of curves or surfaces consisting of two families whose components where they intersect are mutually perpendicular (as the lines of force and the equipotential surfaces in an electrostatic field)
noun
: a system of curves or surfaces consisting of two families whose components where they intersect are mutually perpendicular (as the lines of force and the equipotential surfaces in an electrostatic field)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012