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| Terms for subject Environment (5878 entries) |
| polyethylene terephtalate (1. A thermoplastic polyester resin made from ethylene glycol and terephthalic acid; melts at 265°C; used to make films or fibers. 2. Type of plastic used to make artificial fibres and plastic bottles, which can be recycled) | ترفتالات البولي إيثيلين | |
| polygon (In the vector type of GIS internal data organization spatial data are conveniently divided into point, line and polygon types. Some vector GIS store information in the form of points, line segments and point pairs; others maintain close lists of points defining polygon regions) | متعدد الأضلاع | |
| polymer (Substance made of giant molecules formed by the union of simple molecules (monomers)) | البوليمر | |
| polymerisation (1. The bonding of two or more monomers to produce a polymer. 2. Any chemical reaction that produces such a bonding) | البلمرة | |
| polyvinyl chloride (Polymer of vinyl chloride; tasteless, odourless; insoluble in most organic solvents; a member of the family of vinyl resins, PVC) | كلوريد البلوليفينيل | |
| pond (A natural body of standing fresh water occupying a small surface depression, usually smaller than a lake and larger than a pool) | بركة | |
| pondweed | حشائش البرك | |
| pool (A small, natural body of standing water, usually fresh; e.g. a stagnant body of water in a marsh, or a still body of water within a cave) | حوض | |
| population (A group of organisms of one species, occupying a defined area; ecological) | السكان | |
| population density (The number of people relative to the space occupied by them) | كثافة السكان | |
| population distribution (The density, dispersal pattern and apportionment of the total number of persons in any area) | توزيع السكان | |
| population dynamics (The process of numerical and structural change within populations resulting from births, deaths, and movements) | ديناميات السكان | |
| population ecology (The study of the interaction of a particular species or genus population with its environment) | إيكولوجيا السكان | |
| population growth (An increase in the total number of inhabitants of a country, city, district or area) | النمو السكاني | |
| population movement (Any shift or migration of a statistically significant number of persons inhabiting a country, district or area) | حركة السكان | |
| population structure (The organization of, and inter-relationships among, inhabitants of a given region, country or city) | بنية السكان | |
| population trend (The direction of change in the total number of persons inhabiting a country, city, district or area) | توجه التطور السكاني | |
| poriferan (The sponges, a phylum of the animal kingdom characterized by the presence of canal systems and chambers through which water is drawn in and released; tissues and organs are absent) | الإسفنج | |
| posidonia (Plant with elongated, planar, green leaves which measure up to 1,5 m. The flowers come out in the autumn but not every year. The fruits are dark balls, which one often finds washed up on beaches after storms. The same happens with the leaves which wilt and separate from the plant at the end of summer. It grows on sandy substrates, and has a rhizome from which several plants grow. The compact form of its growths retains the sediments pulled by the currents along the sea bed. Neptunegrass forms extensive prairies, always on the continental shelf. The plant's presence, apart from constituting an excellent refuge and food reserve for many species, gives an indication of the maturity and good condition of the whole marine ecosystem) | البوزيدونيا | |
| post-treatment (Treatment of treated water or wastewater to improve the water quality) | ما بعد المعالجة |