A form of surfactant that accumulates at the two-dimensional boundaries between three immiscible phases

plural of lineactant

(astronomy, geology) Any long marking, dark or bright, on a planet or moon's surface.

(anatomy) A fibrous structure that runs down the midline of the abdomen in humans and other vertebrates.

A dark vertical line, running up the abdomen from the pubis to the navel (though it sometimes runs further, to the top of the abdomen) that forms during pregnancy.

Able to be lined.