san·a·to·ri·um noun \ˌsan-ə-ˈtōr-ē-əm, -ˈtȯr-\
plural san·a·to·ri·ums or san·a·to·ria \-ē-ə\
: an establishment that provides therapy combined with a regimen (as of diet and exercise) for treatment or rehabilitation
a : an institution for rest and recuperation (as of convalescents) b : an establishment for the treatment of the chronically ill <a tuberculosis sanatorium>
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