noun - An abundant layer of hypodermis, also called subcutaneous tissue, that is mainly used for fat storage and a natural means to help tolerate cold water by marathon 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].
The channel swimmer ate a box of donuts every morning in order to add to his layer of bioprene.
Synonym: Channel fat