(geometry) A line with no curvature; a line with constant direction. The path of shortest length between two points.

(snooker) The line at the baulk end of a snooker table, upon which the green, yellow and brown balls are initially placed.

Alternative spelling of hotline

(rugby league, soccer, hurling, Gaelic football) the boundary of the field that runs along its width at each end, and across the front of the goal.

(physics, astronomy) A spectral line that corresponds to the absorption of electromagnetic radiation at a specific wavelength; the pattern of such lines is characteristic of specific atoms or molecules in the path of the radiation.

A sense organ of a fish running lengthwise down each of its sides from the vicinity of the operculum to the base of the tail, used to detect movement and vibration in the surrounding water.

(baseball) A .200 batting average, which is around the minimum batting average a player with strong defensive skills can have and still stay in the major leagues. Named for Mario Mendoza.

Alternative spelling of hemline

On a typewriter, the action of the carriage roller to push the page up one or more lines, often simultaneously with executing a carriage return.

To advance the page one line at a time, particularly in rapid succession.