<B>geometrical optics,</B><DL COMPACT><DD> the branch of optics that deals with the formation and structure of images, using geometric methods of description. </DL>
<B>geometrician, </B>noun.<DL COMPACT><DD> an expert in geometry. </DL>
<A NAME="geometricism">
<B>geometricism, </B>noun.<DL COMPACT><DD> the application of geometric principles to fields other than mathematics and science, especially in modern abstract art. </DL>
<A NAME="geometricmean">
<B>geometric mean,</B><DL COMPACT><DD> the mean of a number (<I>n</I>) of positive quantities produced by taking the <I>n</I>th root of their product. <BR> <I>Ex. The geometric mean of the two quantities of 16 and 4 is the square root of their product, or 8.</I> </DL>
<A NAME="geometricprogression">
<B>geometric progression,</B><DL COMPACT><DD> a series of numbers in which each number is multiplied by the same factor in order to obtain the following number. 2, 4, 8, 16, and 32 form a geometric progression. See also <B>arithmetical progression.</B> </DL>
<A NAME="geometricproportion">
<B>geometric proportion,</B><DL COMPACT><DD> an equation between ratios. <BR> <I>Ex. 4:16 = 1:4 is a geometric proportion.</I> </DL>
<A NAME="geometricratio">
<B>geometric ratio,</B><DL COMPACT><DD> the constant ratio of a term of a geometric progression to the preceding term. </DL>
<B>geometric style,</B><DL COMPACT><DD> a style of art characterized by simple geometric patterns or stylized figures arranged in an orderly manner, found especially in some Greek vase paintings and some tracery in English architecture. </DL>
<A NAME="geometrictracery">
<B>geometric tracery,</B><DL COMPACT><DD> tracery in some English architecture, characterized by delicate geometric patterns. </DL>
<A NAME="geometrid">
<B>geometrid, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> any one of a family of slender gray or greenish moths whose larvae have legs at the ends of the body, causing them to travel with a looping motion and to be called <I>measuring worms</I> or <I>inchworms.</I> Geometrids move by bringing the rear end of the body forward, thus forming a loop, and then advancing the front end. <BR> <I>Ex. Some geometrid caterpillars are able to camouflage themselves by sticking out at an angle from a twig, like a twig (New Yorker).</I> <DD><I>adj. </I> of or having to do with a geometrid. </DL>
<A NAME="geometrism">
<B>geometrism, </B>noun.<DL COMPACT><DD> a movement in modern art, similar to cubism, that emphasizes the use of geometric lines and figures. </DL>
<A NAME="geometrist">
<B>geometrist, </B>noun. =geometrician.</DL>
<A NAME="geometrize">
<B>geometrize, </B>verb, <B>-trized,</B> <B>-trizing.</B><DL COMPACT><DD><I>v.i. </I> to work by geometric methods. <DD><I>v.t. </I> to form geometrically. </DL>
<A NAME="geometry">
<B>geometry, </B>noun, pl. <B>-tries.</B><DL COMPACT><DD><B> 1. </B>the branch of mathematics that measures and compares lines, angles, surfaces, and solids in space; mathematics of space. Geometry includes the definition, comparison, and measurement of squares, triangles, circles, cubes, cones, spheres, and other plane and solid figures. (Abbr:) geom. <DD><B> 2. </B>a book about geometry. <DD><B> 3. </B>shape or design. <BR> <I>Ex. the geometry of high white buildings.</I> </DL>
<A NAME="geomorphic">
<B>geomorphic, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with the figure of the earth or the form of its surface. <DD><B> 2. </B>resembling the earth. </DL>
<A NAME="geomorphological">
<B>geomorphological, </B>adjective.<DL COMPACT><DD> of or having to do with geomorphology. <BR> <I>Ex. One of the best geomorphological arguments for the stability of the present ice level ... (E. F. Roots)</I> adv. <B>geomorphologically.</B> </DL>
<A NAME="geomorphologist">
<B>geomorphologist, </B>noun.<DL COMPACT><DD> a person who studies geomorphology. </DL>
<A NAME="geomorphology">
<B>geomorphology, </B>noun.<DL COMPACT><DD> the study of the arrangement, origin, and changes of the earth's surface features. </DL>
<A NAME="geonavigation">
<B>geonavigation, </B>noun. =dead reckoning.</DL>
<A NAME="geophagism">
<B>geophagism, </B>noun. =geophagy.</DL>
<A NAME="geophagist">
<B>geophagist, </B>noun.<DL COMPACT><DD> a person who eats earth. </DL>
<A NAME="geophagy">
<B>geophagy, </B>noun.<DL COMPACT><DD> the practice of eating earth. </DL>
<A NAME="geophilous">
<B>geophilous, </B>adjective.<DL COMPACT><DD><B> 1. </B>(Zoology.) living on or in the ground, as various snails or worms. <DD><B> 2. </B>(Botany.) growing in the ground, as various plants with deep underground buds. </DL>
<A NAME="geophone">
<B>geophone, </B>noun.<DL COMPACT><DD> an instrument that responds to vibrations of the earth. By timing seismic waves, set up artificially by explosives, it can be used in exploring the composition of the earth's crust through which the waves pass. It is used in locating fires in coal mines and in rescue operations there. </DL>
<A NAME="geophysical">
<B>geophysical, </B>adjective.<DL COMPACT><DD> of or having to do with geophysics. <BR> <I>Ex. The geophysical Earth is a huge, spinning, electromechanical rotor, intimately engaged in its immediate cosmic environment (Bulletin of Atomic Scientists).</I> </DL>
<A NAME="geophysicalyear">
<B>Geophysical Year,</B><DL COMPACT><DD> a year set aside for the study of the earth, especially its interior, the atmosphere, magnetic and gravitational phenomena, and the like. Scientists from all parts of the world participate. The International Geophysical Year, from July 1957, to December, 1958, resulted in the most extensive geophysical investigations ever conducted. </DL>
<A NAME="geophysicist">
<B>geophysicist, </B>noun.<DL COMPACT><DD> a person who studies geophysics. </DL>
<A NAME="geophysics">
<B>geophysics, </B>noun.<DL COMPACT><DD> the science dealing with the relations between the physical features of the earth and the forces that change or produce them; physics of the earth. Geophysics includes geology, meteorology, seismology, and similar sciences. </DL>
<A NAME="geophyte">
<B>geophyte, </B>noun.<DL COMPACT><DD> (Botany.) a plant which grows in earth, especially one having deep underground buds. </DL>
<A NAME="geoplanetology">
<B>geoplanetology, </B>noun.<DL COMPACT><DD> the study of the material composition and formation of the planets; the geology of the planets. </DL>
<A NAME="geopolitic">
<B>geopolitic, </B>adjective. =geopolitical.</DL>
<A NAME="geopolitical">
<B>geopolitical, </B>adjective.<DL COMPACT><DD> having to do with or involved in geopolitics. <BR> <I>Ex. The new era would be a "geopolitical" era, for the conquest of space had rendered the old maritime empires obsolete (Atlantic).</I> adv. <B>geopolitically.</B> </DL>
<A NAME="geopolitician">
<B>geopolitician, </B>noun.<DL COMPACT><DD> an expert in geopolitics. </DL>
<A NAME="geopolitics">
<B>geopolitics, </B>noun.<DL COMPACT><DD><B> 1. </B>the study of government and its policies as affected by physical geography. <DD><B> 2. </B>the theory popular with the Nazis that politics is dependent on geography, and that expansion into new territories is justified by economic and political needs. </DL>
<A NAME="geoponic">
<B>geoponic, </B>adjective.<DL COMPACT><DD><B> 1. </B>of or having to do with agriculture; agricultural. <DD><B> 2. </B>rustic. </DL>
<A NAME="geoponics">
<B>geoponics, </B>noun.<DL COMPACT><DD><B> 1. </B>the art or science of agriculture. <DD><B> 2. </B>a book about geoponics. </DL>
<A NAME="geopressured">
<B>geopressured, </B>adjective.<DL COMPACT><DD> under great pressure from geologic forces. <BR> <I>Ex. Success was also reported in tapping an unconventional source of natural gas--geopressured brine, or salt-containing water that has been subject to pressure from geological formations (Janet Raloff).</I> </DL>
<A NAME="georama">
<B>georama, </B>noun.<DL COMPACT><DD> a large, hollow globe which has a map of the earth's surface on the inside. It is to be viewed from within the globe. </DL>
<A NAME="geordie">
<B>geordie</B> (1), noun.<DL COMPACT><DD> (Scottish and Northern English.) a guinea (coin) bearing the figure of Saint George. </DL>
<A NAME="geordie">
<B>geordie</B> (2), noun.<DL COMPACT><DD> (Scottish and Northern English.) <DD><B> 1. </B>a type of safety lamp used by coal miners. <DD><B> 2. </B>a coal miner. </DL>
<A NAME="george">
<B>George, </B>noun.<DL COMPACT><DD><B> 1. </B>a part of the insigne of the Order of the Garter representing Saint George slaying the dragon. It may be a piece set with jewels or a single carved gem. <BR> <I>Ex. Look on my George; I am a gentleman (Shakespeare).</I> <DD><B> 2. </B>(British Slang.) an automatic pilot of an airplane. <DD><B> 3. </B>(Archaic.) any English coin bearing the image of Saint George, such as a half crown. <BR><I>expr. <B>by George,</B> </I>an exclamation or mild oath. <BR> <I>Ex. I mean what I say, by George I do! (F. Anstey).</I> <BR><I>expr. <B>let George do it,</B> </I>(Informal.) to relinquish personal responsibility and depend on another to accomplish an end. <BR> <I>Ex. ... a tireless energy in serving humanity himself rather than letting George do it (William Barrett).</I> </DL>
<A NAME="georgecross">
<B>George Cross</B> or <B>Medal,</B><DL COMPACT><DD> the highest award for civilian bravery presented by Great Britain. It was instituted in 1940 by George VI, and ranks second in distinction only to the Victoria Cross. </DL>
<A NAME="georgette">
<B>georgette, </B>noun.<DL COMPACT><DD> a thin, fine silk cloth with a slightly wavy surface, used for dresses and other garments. </DL>
