S: (n) rhumb line, rhumb, loxodrome (a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction)
S: (n) side (a line segment forming part of the perimeter of a plane figure) "the hypotenuse of a right triangle is always the longest side"
S: (n) waterline, water line, water level (a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship)
S: (n) path, track, course (a line or route along which something travels or moves) "the hurricane demolished houses in its path"; "the track of an animal"; "the course of the river"
S: (n) line of force, field line (an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point)
S: (n) facility, installation (a building or place that provides a particular service or is used for a particular industry) "the assembly plant is an enormous facility"