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

plural of linea

(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.

(aerology, aerography, planetology) An ephemeral dark linear feature found on slopes that recurs seasonally.

plural of recurrent slope linea

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

plural of lineactant

Able to be lined.