naphthenate A drying agent in paints that also includes lead, cobalt, calcium, or manganese salt.

napiform A botanical term that means turnip-shaped.

natatorium A swimming pool.

National Electrical Code A nationally (U.S.A.) accepted guide to safe installation of wiring along with its associated equipment.

National Electrical Manufacturers Association (NEMA) A trade group of electrical manufacturers providing standards of electrical construction and dimensional uniformity of equipment.

National Electrical Safety Code (NESC)

Electrical rules prepared by the NEMA and approved by ANSI.

National Historic Landmark A historical marker or place of significance often with a structure, sign, kiosk, or expanded facilities explaining its significance to tourists.

National Register of Historic Places A

U.S. government organization that maintains information on structures, objects, districts, and sites of national, state, or local historical significance.

National Resources Conservation Service (NRCS) A U.S. government agency, formerly known as the Soil Conservation Service (SCS) within the Department of Agriculture, providing leadership and administering programs to help people conserve, maintain, improve, and sustain natural resources and environment. It provides statistical information, maps, technical assistance, and funds soil conservation and farmland protection programs. NRCS has offices in all states and in most rural counties.

National Trust for Historic Preservation

A nonprofit private organization chartered by the U.S. Congress to encourage preservation of historic buildings, objects, and sites in America. Address: 1785 Massachusetts Avenue, NW, Washington, DC 20036.

native plant 1. A plant that can be found growing and reproducing without human assistance in an area. 2. A plant that was found growing and reproducing in an area before recent (usually a point in time specified) human assistance in becoming established. Humans by nature have always moved seed from one location to another in clothing, food, domesticated animals, or their belongings, hence the necessity of specifying a time period.

native species Any species of living organisms that are found existing and reproducing naturally in a specific area. The difficulty is that nature rarely makes boundaries the same for living organisms, while most boundaries of states, counties, etc. are arbitrary in relation to ecosystems.

native vegetation Any indigenous plant adapted to soil and climatic conditions of an area.

natural-cleft A term used to describe stone split (cleaved) parallel to its stratification for an irregular, somewhat flat, surface.

natural convection Air or water movement due to differences in density resulting from variations in temperature causing movement or circulation.

natural drainage The flow of water over undisturbed existing surface topography of the earth.

natural environment The area surrounding a living organism including the area surrounding and influencing humans, but in most cases not including anything influenced by humans. This

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