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plane1 a flat or level surface. [4 definitions]
plane2 a hand tool with a blade, used to make the surface of wood smooth or even. [2 definitions]
planet a large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system.
planetarium a device that projects images of the sun, moon, stars, and planets on a ceiling that is shaped like a dome. [2 definitions]
plank a length of wood thicker than a board.
plankton a mixture of very small plants and animals floating in fresh or salt water. Most kinds of plankton are microscopic. Plankton is an important food source for many animals that live in water.
planner a person who plans, especially a person who plans things such as towns and cities. [2 definitions]
planning the act of figuring out how to do something ahead of time.
plant one of a large group of living things that use sunlight to make their own food. Most plants have leaves, stems, roots and either flowers or cones. Plants use a green pigment called chlorophyll to absorb energy from sunlight. Grasses, trees, vines, vegetables, cactuses, ferns and mosses are plants. [5 definitions]
plantain1 a fruit similar to the banana, but larger, firmer, and less sweet. Plantains have a lot of starch and are eaten as a cooked vegetable.
plantation a large farm or estate used for growing rubber, cotton, or other crops to sell.
plaque a flat plate or tablet, with writing or decoration on it, that is hung on a wall. [2 definitions]
plasma the clear, liquid part of blood. Blood cells are suspended in the plasma.
plaster a paste of sand, lime, and water that becomes hard when it dries. Plaster is used to cover walls and ceilings. [3 definitions]
plastic an artificial substance made from certain kinds of chemicals that can be easily shaped when soft. Plastic is formed into many materials and products. [4 definitions]
plate a flat, round dish from which food is served or eaten; the food on such a dish. [5 definitions]
plateau a high, level area of land.
plate tectonics (used with a singular verb) a theory that scientists use to explain the movement of continents, the eruption of volcanoes, and other changes or events in the earth's geology. The theory of plate tectonics says that the earth's crust is made up of separate sections that are like very large plates. These sections move around constantly because they float on melted rock. The movement of these sections of the crust causes earthquakes.
platform a raised, level surface used as a stage. [3 definitions]
platinum a soft, heavy, silver-white metal that is one of the chemical elements. Platinum is very valuable and is used in making jewelry. It can be combined with other metals to form alloys. (symbol: Pt)
platoon a military unit of two or more squads that is led by a lieutenant and has its own headquarters.