plural of point-in-line

(physics) A path in spacetime, especially that traversed by an elementary particle from its creation to its destruction.

(astronomy) The intersection of an orbiting object's orbital plane with the plane of reference.

(physics) A visual aid for visualizing vector fields; a line drawn such that the direction of its tangent at any point equals the direction of the vector at that point.

plural of fault line

Alternative form of cutline

plural of contour line

plural of line-out

(cartography, navigation) A line on a chart or map joining points of zero magnetic declination.

(computing) A high-speed impact printer, most often used by older mainframes, that prints an entire line in a single operation