(military) The networks of land, water, and air routes that connects a battlefield and its military personnel, supplies, etc. / A chain of communications through an established system.

Alternative form of line of communication

plural of peace line

(often in the plural) A separation barrier in Northern Ireland that separates a predominantly republican and Catholic neighbourhood from a predominantly loyalist and unionist Protestant neighbourhood.

plural of panty line

The outline of a person's underpants visible through their outer clothing.

(anatomy) A ridge on the inner side of the mandible extending from the junction of the two halves of the bone in front to the last molar on each side and giving attachment to the mylohyoid muscle and to the superior pharyngeal constrictor.

plural of line walker

Alternative form of linewalker

(business) all the goods sold by a manufacturing firm; a group of similar items sold by the same company