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Bioprene (noun): (a) An abundant layer of hypodermis or subcutaneous tissue, that is mainly used for fat storage and which comes with age or inactivity. (b) A purposefully added layer of fat used as a natural means to help tolerate cold water by channel swimmers. Origin: bio + neoprene or polychloroprene, a synthetic rubber that is used for wetsuits. Neoprene is the DuPont trade name for its brand of polychloroprene.
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