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The Collaborative International Dictionary
Arenation

Arenation \Ar`e*na"tion\ ([a^]r`[-e]*n[=a]"sh[u^]n), n. [L. arenatio, fr. arena sand.] (Med.) A sand bath; application of hot sand to the body.
--Dunglison. [1913 Webster] ||

Wiktionary
arenation

n. A form of therapeutic bathing in hot sand.

Wikipedia
Arenation

Arenation is an uncommon kind of therapeutic dry bath, using hot sand. At various times it has been described as "applied", sprinkled upon a patient, or putting the feet in the hot sand. The term is from the Latin arenatio, from arena, "sand".