Etymology
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Words related to sanitary

sane (adj.)

"of sound mind, mentally sound," 1721, a back-formation from insane or sanity or else from Latin sanus "sound, healthy," in its figurative or transferred use, "of sound mind, rational, sane," also, of style, "correct;" a word of uncertain origin.

It is perhaps from PIE *seh-no- from *seh- "to tie." That reconstruction "is purely mechanical," according to de Vaan, the meaning might be "which is in place, in order." Or it could be from a different root meaning "to satisfy" as in Latin satis "enough."

Used earlier, of the body, with a sense of "healthy" (1620s), but this has been rare in English. OED writes, "The almost entire restriction in English to a sense 'mentally sound' is due to the use in antithesis with insane, which (like the Latin insanus, its source) always referred to mental condition." Related: Sanely; saneness.

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sanitarium (n.)

1829, "an improper form for sanatorium" [Century Dictionary], meant to indicate "place dedicated to health," perhaps based on sanitary or from Latin sanitas "health," from sanus "healthy; sane" (see sane).

sanitation (n.)

1848, "practical and scientific methods of preservation of health and promotion of sanitary conditions," irregularly formed from sanitary. The somewhat euphemistic use in reference to garbage and domestic waste disposal is (as in sanitation engineer) is by 1916 (sanitation man).

sanitize (v.)

1836 (implied in sanitizing, and treating it as a new word), from stem of sanitary + -ize. The figurative use for "render more acceptable by removing objectionable elements" is by 1934, said to be a word from Roosevelt's N.R.A. Related: Sanitized. Also in use was sanify "make healthy, improve in sanitary condition" (1836).

unsanitary (adj.)
1871, from un- (1) "not" + sanitary (adj.).