hy·giene

[hahy-jeen]
noun
1.
Also, hygienics. the science that deals with the preservation of health.
2.
a condition or practice conducive to the preservation of health, as cleanliness.

Origin:
1590–1600; < French hygiène < Neo-Latin hygieina < Greek hygieinḕ (téchnē) healthful (art), feminine of hygieinós healthful, equivalent to hygiḗ(s) healthy + -inos -ine1

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Collins
World English Dictionary
hygiene (ˈhaɪdʒiːn) [Click for IPA pronunciation guide]
 
n
1.  Also called: hygienics the science concerned with the maintenance of health
2.  clean or healthy practices or thinking: personal hygiene
 
[C18: from New Latin hygiēna, from Greek hugieinē, from hugiēs healthy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Hygiene is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

hygiene
1671, from Fr. hygiène, ult. from Gk. hygieine techne "the healthful art," from hygies "healthy," lit. "living well" (personified as the goddess Hygieia), from PIE *eyu-gwie-es- "having a vigorous life." The Gk. adj. was used by Aristotle as a noun meaning "health." Hygienic is 1833 borrowing
of Fr. hygiénique.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hygiene hy·giene (hī'jēn')
n.

  1. The science that deals with the promotion and preservation of health. Also called hygienics.

  2. The conditions and practices that serve to promote or preserve health, as those followed for personal hygiene.


hy·gien'ist (hī-jē'nĭst, hī'jē'-, hī-jěn'ĭst) n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He urged the draining of swamps and the enforcement of hygiene in the town's
  food market.
I've never heard of anyone being poisoned by the tiny amounts of fluorine in
  water & dental hygiene products.
The hot water allows better hand-washing and thus better hygiene.
Medical professionals love how no-touch thermometers solve hygiene issues.
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