[AS. lin, flax; and seed, seed.] The seed of flax, largely used for making linseed-oil and oil-cake. In making oil the seeds are bruised or crushed, then ground and pressed in a hydraulic or screw-press, either cold or heated by steam. The seeds give more oil when heated, but the cold-pressed oil is the best. Linseed-oil is largely used in making paints, varnishes, and printing inks. The remains of the seeds after the oil is pressed out make oil-cake, which is valuable for feeding cattle. Linseed itself is excellent food for cattle and for poultry.