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hard

1. Chem (of water) impairing the formation of a lather by soap
2. (of alcoholic drink) being a spirit rather than a wine, beer, etc.
3. (of a drug such as heroin, morphine, or cocaine) highly addictive
4. Physics (of radiation, such as gamma rays and X-rays) having high energy and the ability to penetrate solids
5. Physics (of a vacuum) almost complete
6. Chiefly US (of goods) durable
7. politically extreme
8. Brit a roadway across a foreshore
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

hard

[härd]
(materials)
Quality of a material that is compact, solid, and difficult to deform.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in classic literature ?
I can speak with authority on the subject of being hard up.
Sometimes he was peevish and hard to please, sometimes he growled because his reader could not manage the dry books he wished to hear, and sometimes he was so despondent that her heart ached to see him.
One day he had worked me hard in every way he could, and when I lay down I was tired, and miserable, and angry; it all seemed so hard.
I used to be hard sometimes: I'll never be hard again.
But she's troubled in her mind: and when the fits are not on her,--and that's not often, for she is dying very hard,--she says she has got something to tell, which you must hear.
Fuchs had been a cowboy, a stage-driver, a bartender, a miner; had wandered all over that great Western country and done hard work everywhere, though, as grandmother said, he had nothing to show for it.
He would clearly have died sooner than own it was hard work for him.
After some weeks the scraps of paper became little hard round balls, and when the pockets were filled he dumped them out upon the floor.
I don't know how master brought her to the house, being hard at work at the time.