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8 Words That Are Older Than You Think

flotation tank

noun
1.
an enclosed ventilated tank filled with a saline solution at body temperature, in which a person floats in darkness in order to relax or meditate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for flotation tank
noun

a tank of salt water in which a person can float for deep relaxation

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