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A spa is a location where mineral-rich spring water (and sometimes sea water) is used to give medicinal baths. Spa towns or spa resorts (including hot springs resorts) typically offer various health treatments, which are also known as balneotherapy. The belief in the curative powers of mineral waters goes back to prehistoric times. Such practices have been popular worldwide, but are especially widespread in Europe and Japan. Day spas are also quite popular, and offer various personal care treatments. ==Origins of the term== The term is derived from the name of the town of Spa, Belgium, whose name is known back to Roman times, when the location was called ''Aquae Spadanae'',〔Journal of the History of Medicine and Allied Sciences, George Rosen, Yale University Dept. of the History of Science and Medicine, Project Muse, H. Schuman, 1954〕 sometimes incorrectly connected to the Latin word “spargere” meaning to scatter, sprinkle or moisten.〔(A brief history of spa therapy, A van Tubergen and S van der Linden )〕 Since medieval times, illnesses caused by iron deficiency were treated by drinking chalybeate (iron-bearing) spring water (in 1326, the ironmaster Collin le Loup claimed a cure,〔Medical Hydrology, Sidney Licht, Sidney Herman Licht, Herman L. Kamenetz, E. Licht, 1963 (Google Books )〕 when the spring was called ''Espa'', a Walloon word for "fountain"〔). In 16th-century England, the old Roman ideas of medicinal bathing were revived at towns like Bath (''not'' the source of the word bath), and in 1596 William Slingsby who had been to the Belgian town (which he called ''Spaw'') discovered a chalybeate spring in Yorkshire. He built an enclosed well at what became known as Harrogate, the first resort in England for drinking medicinal waters, then in 1596 Dr Timothy Bright after discovering a second well called the resort ''The English Spaw'', beginning the use of the word ''Spa'' as a generic description. It is commonly claimed, in a commercial context, that the word is an acronym of various Latin phrases such as "''Salus Per Aquam''" or "''Sanitas Per Aquam''" meaning "health through water".〔For instance, 'Leisure and Recreation Management', George Torkildsen, Routledge, 2005, ISBN 0-415-30995-6 (Google Books )〕 This is very unlikely: the derivation does not appear before the early 21st century and is probably a backronym as there is no evidence of acronyms passing into the language before the 20th century;〔(World Wide Words )〕 nor does it match the known Roman name for the location.〔(Spa on Factoids )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「spa」の詳細全文を読む スポンサード リンク
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