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Definition of Green roof
1. Noun. A roof of a house or other building which is painted or otherwise colored green. ¹
2. Noun. A roof of a house or other building which is covered with soil and grass, plants, trees, or other landscaping materials. ¹
3. Noun. A roof of a house or other building on which solar panels, solar hot water collectors, wind powered turbines, or other natural energy collectors are placed. ¹
4. Noun. A roof of a house or other building which is designed to collect rainfall for use in gardens, lawns, or as drinking water. ¹
¹ Source: wiktionary.com