field line

English Thesaurus

1. an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point (noun.phenomenon)

hypernym	:	line,
definition	:	a spatial location defined by a real or imaginary unidimensional extent (noun.location)

hyponym	:	electrical line of force,
definition	:	a line of force in an electrical field (noun.phenomenon)

hyponym	:	magnetic line of force,
definition	:	a line of force in a magnetic field (noun.phenomenon)