| planets | Heavenly bodies with their own motion among the stars, revolving, in the case of the solar system, around the sun, along the plane of the ecliptic. They are grouped into inner planets and outer planets, based on distance from the sun and common characteristics. (12 Dec 1998) |
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| planifolious | <botany> Flat-leaved. Origin: Plani- + L. Folium leaf. Source: Websters Dictionary (01 Mar 1998) |
| planiform | <anatomy> Having a plane surface; as, a planiform, gliding, or arthrodial articulation. Source: Websters Dictionary (01 Mar 1998) |
| planigraphy | Synonym: tomography. Origin: L. Planum, plane, + G. Graphe, a writing (05 Mar 2000) |
| planimeter | An instrument formed of jointed levers with a recording index, used for measuring the area of any surface, by tracing its boundaries. Origin: L. Planum, plane, + G. Metron, measure (05 Mar 2000) |
| planimetry | The measurement of surface areas and perimeters by tracing the boundaries. Planimetry on photomicrographs or projected images may be used to evaluate the size of cells. (05 Mar 2000) |
| planing | Fr. Plane, Planing machine. See Planer. A complex machine for planing wood, especially boards, containing usually a rapidly revolving cutter, which chips off the surface in small shavings as the piece to be planed is passed under it by feeding apparatus. Source: Websters Dictionary (01 Mar 1998) |
| planipennia | <zoology> A suborder of Neuroptera, including those that have broad, flat wings, as the ant-lion, lacewing, etc. Synonym: Planipennes. Origin: NL, fr. L. Planus plane + penna wing. Source: Websters Dictionary (01 Mar 1998) |
| planipetalous | <botany> Having flat petals. Origin: Plani- + petal. Source: Websters Dictionary (01 Mar 1998) |
| planithorax | A diagram of the chest showing the front and back in plane projection, after the manner of Mercator's projection of the earth's surface. (05 Mar 2000) |
| plank | 1. To cover or lay with planks; as, to plank a floor or a ship. "Planked with pine." 2. To lay down, as on a plank or table; to stake or pay cash; as, to plank money in a wager. 3. To harden, as hat bodies, by felting. 4. To splice together the ends of slivers of wool, for subsequent drawing. Planked shad, shad split open, fastened to a plank, and roasted before a wood fire. Origin: Planked; Planking. Source: Websters Dictionary (01 Mar 1998) |
| planking | 1. The act of laying planks; also, planks, collectively; a series of planks in place, as the wooden covering of the frame of a vessel. 2. The act of splicing slivers. See Plank. Source: Websters Dictionary (01 Mar 1998) |
| plankter | Any type of plankton. (05 Mar 2000) |
| plankton | <marine biology> Small (often microscopic) plants and animals floating, drifting or weakly swimming in bodies of fresh or salt water. (31 Dec 1997) |
| planktonic | Relating to plankton;plankton-like. (05 Mar 2000) |