polytunnelEtymologyShort for polythene tunnel.nounA tunnel made of polyethylene, used to grow plants that require a higher temperature and/or humidity than that which is available in the environment.“Regan and her team decide which of the farm's 3,000 polytunnels of strawberries will be dedicated to Wimbledon a few weeks before the tournament, and they choose from among the roughly 800 seasonal workers for roles on the coveted picking operation.”