1. A plant with dormant parts located underground.
2. A plant having perennating organs (surviving from year to year) or renewal buds below the surface of the soil.
1. A rounded, more or less hollow concretion or separable nodule of rock lined with inward-projecting crystals which differ in composition from the enclosing rock or the crystal-lined cavity in such a hollowed rock.
2. A hollow, roughly spherical rock mass containing a cavity, lined or filled with crystals lining the inside walls, that have grown unimpeded and so are frequently perfectly formed.
3. Etymology: from French géode; from Latin geodes; from Greek geodes, "earthy, earth-like"; from ge-, "earth".
A genus of bacteria that retain the color of a gentian violet stain, aerobic bacteria, in the family Dermatophilaceae, occurring in soil, with a tendency toward mycelial (mass of branched, tubular filaments of fungi) growth, the mass of fine branching tubes (known as hyphae) that forms the main growing structure of a fungus.
Visible structures like mushrooms are reproductive structures produced by the mycelium or the mass of fibers formed by certain bacteria.
1. Relating to the geometry of curved surfaces.
2. The shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere).
3. Etymology: "surveying", from Modern Latin geodaesia, from Greek geodaisia, "division of the earth" (from ge, "earth" + daiein, "divide").
1. A geodesic dome is a spherical or partial-spherical shell structure or lattice shell based on a network of great circles (geodesics) positioned on the surface of a sphere.
2. A strong prefabricated enclosure constructed of lightweight bars forming a grid of polygons, with no internal supports.
The dome is energy efficient because it requires less building material and has less surface area, because heat loss due to wind turbulence is decreased, and because its shape minimizes air leakage.
geodesic line, geodetic line
1. The line of shortest distance between any two points on a mathematically defined surface.
2. Specifically, on the surface of the earth, a line of double curvature; which usually lies between the two normal section lines determined by the two points.
Also known as the geodesic dome, a dome or structure that roughly approximates a hemisphere constructed of many light, straight structural elements in tension, arranged in a framework of triangles to reduce stress and weight.
geodesist (s) (noun)
, geodesists (pl)
Someone who specializes in the size and shape of the earth: Peter was so interested in the planet he lived on that he decided that he wanted to become a geodesist and be able to determine the exact positions of specific geographical points and the planet's curvature and its dimensions, but first he had to study geology at the university.
1. The size and shape of the earth, the measurement of terrestrial gravitational forces, and the location of fixed points on the earth's surface.
2. The branch of science that deals with the precise measurement of the size and shape of the earth, the mapping of points on its surface, and the study of its gravitational field.
3. A subdivision of geophysics which includes the determination of the size and shape of the earth, the earth's gravitational field, and the location of points fixed to the earth's crust in an earth-referred coordinate system.
4. The determination of the geometry of the earth's surface (both solid and liquid), including the time variability of this geometry.
Determination of the earth's orientation is essential because a number of measurements of geometric quantities involve observations of extraterrestrial objects (artificial satellites, radio stars, etc.). These measurements can not be interpreted without knowledge of the earth's orientation.
Relating to, or employing the theories, techniques, or results of geodesy (utilizing the precise measurement of the earth's surface or of points on its surface).
Relating to the geometry of curved surfaces.
The branch of geodesy (study of the size and shape of the earth) which utilizes astronomical observations to extract geodetic information (precise measurement of the earth's surface or of points on its surface).
A system of horizontal or vertical control stations which have been established and adjusted by geodetic methods and in which the shape and size of the earth (or the geoid) have been considered in computing positions.
1. A reference to a location on earth defined by its latitude, longitude and elevation.
2. The quantities of latitude and longitude which define the position of a point on the surface of the earth with respect to the reference spheroid.
3. The latitude and longitude of a point on the earth's surface determined from the geodetic vertical (normal to the specified spheroid).
1. A reference surface forming the basis for the computation of horizontal-control surveys in which the curvature of the earth is considered.
2. A datum consisting of five quantities: the latitude and longitude of an initial point, the azimuth of a line from this point, and two constants necessary to define the terrestrial spheroid.
Horizontal datum is used for describing a point on the earth's surface, in latitude and longitude or another coordinate system. Vertical datum measures elevations or depths.
The science or technique of measuring gravitational acceleration for the purpose of determining the size and shape of the earth.
Available for further enlightenment: the Earth, Words from the Myths.
Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)":