iron sponge

iron sponge

noun Metallurgy.

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Iron sponge is always a great word to know.
So is impulse. Does it mean:
single, usually sudden, flow of current in one direction
says all planets move in elliptical orbits with the sun at one focus
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