Words related to sanitary
"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.
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).