water-harden

[waw-ter-hahr-dn, wot-er-]

wa·ter-hard·en

[waw-ter-hahr-dn, wot-er-]
verb (used with object) Metallurgy.
to quench (steel) in water.
Compare oil-harden.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Water-harden is always a great word to know.
So is mass. Does it mean:
quantity of matter as determined from its weight or from Newton's second law of motion
says universe's massive particles attract other such particles with force proportional to their mass
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