| plan | (noun) scale drawing of a structure | Synonyms: architectural plan |
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| (noun) a series of steps to be carried out or goals to be accomplished | Synonyms: program, programme |
| (noun) an arrangement scheme | Synonyms: design |
| planaria | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planarian |
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| planarian | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planaria |
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| planation | (noun) the process of erosion whereby a level surface is produced | - |
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| planchet | (noun) a flat metal disk ready for stamping as a coin | Synonyms: coin blank |
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| planchette | (noun) a triangular board supported on casters; when lightly touched with the fingertips it is supposed to spell out supernatural (or unconscious) messages | - |
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| plane | (noun) a carpenter's hand tool with an adjustable blade for smoothing or shaping wood | Synonyms: carpenter's plane, woodworking plane |
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| (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, airplane |
| (noun) a power tool for smoothing or shaping wood | Synonyms: planer, planing machine |
| (noun) (mathematics) an unbounded two-dimensional shape | Synonyms: sheet |
| (noun) a level of existence or development | - |
| planeness | (noun) the property of having two dimensions | Synonyms: flatness, two-dimensionality |
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| planer | (noun) a power tool for smoothing or shaping wood | Synonyms: plane, planing machine |
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| planet | (noun) (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction | Synonyms: major planet |
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| (noun) any celestial body (other than comets or satellites) that revolves around a star | - |
| (noun) a person who follows or serves another | Synonyms: satellite |
| planetarium | (noun) an apparatus or model for representing the solar systems | - |
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| (noun) an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome | - |
| (noun) a building housing an instrument for projecting the positions of the planets onto a domed ceiling | - |
| planetesimal | (noun) one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system | - |
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| planetoid | (noun) any of numerous small celestial bodies that move around the sun | Synonyms: minor planet |
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| plangency | (noun) having the character of a loud deep sound; the quality of being resonant | Synonyms: resonance, reverberance, ringing, sonority, sonorousness, vibrancy |
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| planimeter | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: integrator |
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| plank | (noun) an endorsed policy in the platform of a political party | - |
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| (noun) a stout length of sawn timber; made in a wide variety of sizes and used for many purposes | Synonyms: board |
| planking | (noun) the work of covering an area with planks | - |
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| (noun) (nautical) a covering or flooring constructed of planks (as on a ship) | - |
| (noun) planks collectively; a quantity of planks | - |
| plankton | (noun) the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water | - |
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| planner | (noun) a notebook for recording appointments and things to be done, etc. | - |
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| (noun) a person who makes plans | Synonyms: contriver, deviser |
| planning | (noun) an act of formulating a program for a definite course of action | - |
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| (noun) the act or process of drawing up plans or layouts for some project or enterprise | - |
| (noun) the cognitive process of thinking about what you will do in the event of something happening | Synonyms: preparation, provision |
| planography | (noun) the process of printing from a surface on which the printing areas are not raised but are ink-receptive (as opposed to ink repellent) | Synonyms: planographic printing |
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| plant | (noun) (botany) a living organism lacking the power of locomotion | Synonyms: flora, plant life |
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| (noun) buildings for carrying on industrial labor | Synonyms: industrial plant, works |
| (noun) something planted secretly for discovery by another | - |
| (noun) an actor situated in the audience whose acting is rehearsed but seems spontaneous to the audience | - |
| plantain | (noun) starchy banana-like fruit; eaten (always cooked) as a staple vegetable throughout the tropics | - |
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| (noun) a banana tree bearing hanging clusters of edible angular greenish starchy fruits; tropics and subtropics | Synonyms: Musa paradisiaca, plantain tree |
| (noun) any of numerous plants of the genus Plantago; mostly small roadside or dooryard weeds with elliptic leaves and small spikes of very small flowers; seeds of some used medicinally | - |
| plantation | (noun) garden consisting of a small cultivated wood without undergrowth | Synonyms: grove, orchard, woodlet |
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| (noun) an estate where cash crops are grown on a large scale (especially in tropical areas) | - |
| planter | (noun) a decorative pot for house plants | - |
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| (noun) the owner or manager of a plantation | Synonyms: plantation owner |
| (noun) a worker who puts or sets seeds or seedlings into the ground | - |
| planthopper | (noun) related to the leafhoppers and spittlebugs but rarely damages cultivated plants | Synonyms: plant hopper |
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| plantigrade | (noun) an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings | Synonyms: plantigrade mammal |
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| planting | (noun) the act of fixing firmly in place | - |
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| (noun) putting seeds or young plants in the ground to grow | - |
| (noun) a collection of plants (trees or shrubs or flowers) in a particular area | - |
| plantlet | (noun) a young plant or a small plant | - |
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| plantsman | (noun) an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants) | Synonyms: horticulturist |
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| planula | (noun) the flat ciliated free-swimming larva of hydrozoan coelenterates | - |
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