Chiropractic actual means to "practice by hand".

Founded as a profession in 1898, Chiropractic is the art and science of adjusting/manipulating the articulations of the joints with the aid of physiotherapy and nutrition.

For more information, please visit:

Wikipedia: http://en.wikipedia.org/wiki/Chiropractic_care
American Chiropractic Association: http://www.acatoday.org/level2_css.cfm?T1ID=13&T2ID=61