A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, or high tunnel) is a tunnel made of polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure. Air war...
Found on
http://en.wikipedia.org/wiki/Polytunnel
A greenhouse, hoop house, or similar structure covered in polythene (plastics), used for growing plants.
Found on
https://empressofdirt.net/gardeners-dictionary/
A structure covered with plastic films used for plant protection. Walk-in polytunnels (high tunnels) are approximately 6- to 8-ft. high at the ridge; low polytunnels are rarely more than 18-in. high.
Found on
https://extension.umd.edu/hgic/resource-library/vegetable-gardening-glossar
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