a large tunnel made of polythene and used as a greenhouse
[pol-ee-tip-ik] /ˌpɒl iˈtɪp ɪk/ adjective 1. having or involving many or several types. /ˌpɒlɪˈtɪpɪk/ adjective 1. existing in, consisting of, or incorporating several different types or forms 2. (biology) (of a taxonomic group) having many subdivisions, esp (of a species) having many subspecies and geographical races polytypic pol·y·typ·ic (pŏl’ē-tĭp’ĭk) or pol·y·typ·i·cal (-ĭ-kəl) adj. Having several […]
[pol-ee-uhn-sach-er-it, -uh-reyt] /ˌpɒl i ʌnˈsætʃ ər ɪt, -əˌreɪt/ noun 1. a polyunsaturated fat or fatty acid.
[pol-ee-uhn-sach-uh-rey-tid] /ˌpɒl i ʌnˈsætʃ əˌreɪ tɪd/ adjective, Nutrition. 1. of or noting a class of animal or vegetable fats, especially plant oils, whose molecules consist of carbon chains with many double bonds by hydrogen atoms and that are associated with a low cholesterol content of the blood. /ˌpɒlɪʌnˈsætʃəˌreɪtɪd/ adjective 1. of or relating to a […]
[pol-ee-yoo r-uh-theyn, -yoo-reth-eyn] /ˌpɒl iˈyʊər əˌθeɪn, -yʊˈrɛθ eɪn/ noun, Chemistry. 1. a thermoplastic polymer containing the group NHCOO: used for padding and insulation in furniture, clothing, and packaging, and in the manufacture of resins for adhesives, elastomers, and fillers. /ˌpɒlɪˈjʊərəˌθeɪn/ noun 1. a class of synthetic materials made by copolymerizing an isocyanate and a polyhydric […]