They have had many industrial uses, especially as tough coatings for machine parts, like the rollers of printing presses.

If you soak the seeds overnight to loosen their tough coating, Ipomoeas sprout and grow quickly in hot weather.

The dura mater is the outermost layer, and it forms a tough protective coating.

If no holes are pricked in a potato's tough coating before it is baked, it too will explode.

Meanwhile, trim off and discard the tough outer coating from the Brie.

Some polyureas reach strengths of 6000psi (40MPa) tensile and over 500% elongation making it a tough coating.

The ones usually sold as food have had their tough fibrous outer coating removed.

It is then cooked until it becomes gelatinous, releasing the starch from its tough coating.

Every medulla is protected by a tough coating, called the cortex.