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hard-on
(slang, vulgar) An erection of the penis. / (slang, vulgar, figuratively) A desirous arousal based on a fascination or obsession.
hard
(manner) With much force or effort. / (manner) With difficulty. / (obsolete) So as to raise difficulties. / (manner) Compactly. / (now archaic) Near, close.
Harding
hard on
hard
difficult to bend, break or cut; solid
water hardnesses
plural of water hardness
total hardness
(inorganic chemistry) The sum of calcium and magnesium ion concentrations in water, normally expressed in mmol/L
total hardnesses
plural of total hardness
water hardness
(inorganic chemistry) The level of dissolved calcium salts in water
Vickers hardness
(mechanical engineering) The hardness of a material according to the Vickers hardness test, based on its ability to resist plastic deformation from a standard source.