ultra-clean

ul·tra·clean

[uhl-truh-kleen]
adjective
extremely clean, especially free of germs: an ultraclean laboratory.

Origin:
1965–70; ultra- + clean

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Ultra-clean is always a great word to know.
So is callithumpian. Does it mean:
the offspring of a zebra and a donkey.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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