liners

Liners is a term used in several different fields, referring to various objects and concepts that share a common idea of providing an inner layer or boundary.

Ocean liner or liner ships describe passenger vessels designed for regular, long-distance routes between major ports. They prioritize comfort and speed and are distinct from cargo ships. The term remains in use alongside “cruise liner,” which usually denotes ships used for leisure voyages rather than point-to-point transport.

In cosmetics, a liner is a product used to define features such as the eyes or lips. Eye liners come in pencils, liquids, gels, and pens and are applied along the lash line or eyelid to enhance shape. Lip liners define lip contours and help prevent lipstick from feathering.

Industrial and packaging contexts use liners as protective interior layers. A liner may be placed inside containers, drums, tanks, or bags to prevent leakage, protect contents, or provide a barrier. In environmental and construction settings, liner systems may involve geomembranes or other polymers to contain or separate materials, such as in landfills or water tanks.

In architecture and ship design, a liner refers to the interior surface or paneling that lines a hull, tunnel, or room. Lining provides insulation, aesthetics, or protection for the structure and can be detachable or integral.

Dentistry uses a liner as a protective material placed on dentin or pulp before filling a cavity, commonly using calcium hydroxide or glass ionomer to shield tissue during restoration.

Lastly, liner notes accompany music releases, offering credits, essays, and contextual information about the recording.