Also, hygienics. the science that deals with the preservation of health.
a condition or practice conducive to the preservation of health, as cleanliness.

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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World English Dictionary
hygiene (ˈhaɪdʒiːn)
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]

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Word Origin & History

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')

  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
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Example sentences
Whatever class you travel, surviving airline food is not just a matter of
  taste, it's also a matter of hygiene.
Voters ranked them on hygiene, style and public access.
Bedbugs are not indicative of a lack of hygiene.
Medical professionals love how no-touch thermometers solve hygiene issues.
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