To relieve the distress or suffering of; to provide comfort to.
To make comfortable.
A cause of relief or satisfaction.
Something that offers comfort.
A consolation; something relieving suffering or worry.
Contentment, ease.
The quality of being hard.
An instance of this quality; hardship.
The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
A measure of how hard a material is
The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).