plural of hardness

(slang, vulgar) An erection of the penis. / (slang, vulgar, figuratively) A desirous arousal based on a fascination or obsession.

The quality of being hard. / An instance of this quality; hardship. / (inorganic chemistry) The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).

An English and Irish surname transferred from the given name.

difficult to bend, break or cut; solid

plural of hard drive

(typography) A non-breaking space.

(slang) A tough person. / (New Zealand, slang) An amusing, funny, witty, or possibly strange person. May be used as a term of endearment.

(astronautics) An explosion in a rocket engine during startup, usually due to the presence of too much propellant prior to ignition.

(Internet) An automatic redirect.