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Eng ID Term Definition
2601
isomagnetic line
A line connecting points of equality in some MAGNETIC ELEMENT.
2602
isometric
(adj.). Of or pertaining to equal measure.
2603
isometric latitude
See LATITUDE.
2604
isometric parallel
See PARALLEL.
2605
isopleth
An ISOGRAM of equal or constant value of a given quantity, with respect to either time or space.
2606
isopor
See ISOPORIC LINE.
2607
isoporic line
A line connecting points of equal annual rate of change of a MAGNETIC ELEMENT. Also called isopor.
2608
isopycnic
(adj.). Of or pertaining to equal density.
2609
isopycnic
(n.). See ISOPYCNIC LINE.
2610
isopycnic line
A line connecting points of equal density. Also called isopycnic.
2611
isoradial
A RADIAL from the ISOCENTRE.
2612
isostasy
A condition of approximate EQUILIBRIUM in the outer part of the EARTH, such that the gravita­tio­nal effect of masses extending above the ... more
A condition of approximate EQUILIBRIUM in the outer part of the EARTH, such that the gravita­tio­nal effect of masses extending above the surface of the GEOID in continental areas is approximately coun­terbalanced by a deficiency of density in the material beneath those masses while the effect of deficiency of density in the ocean waters is counter­balanced by an excess of density in the material under the OCEANS.
2613
isostatic anomaly
The difference between an observed value of GRAVITY and a theoretical value at the point of OBSERVATION which has been corrected for ELEVATI... more
The difference between an observed value of GRAVITY and a theoretical value at the point of OBSERVATION which has been corrected for ELEVATION of the STATION above the GEOID and for the effect of TOPOGRAPHY over the whole EARTH, and for its iso­static compensation.
2614
isotherm
In METEOROLOGY, the line which is the locus of points which have the same value of air tempera­ture.
2615
isothermal (or isothermic)
(adj.). Of or relating to equal temperature.
2616
isotope
Two or more nuclides having the same atomic number, hence con­stituting the same element, but differing in mass number.
2617
isotropic (or isotropus)
(adj­.). Having the same physical properties in all directions.
2618
isthmus
A narrow strip of LAND connecting two larger bodies of LAND.
2619
jack-up rig
A rig which provides a stable drilling structure in shallow waters by extending supporting legs onto the seabed. The legs are retracted when... more
A rig which provides a stable drilling structure in shallow waters by extending supporting legs onto the seabed. The legs are retracted when the rig is under tow.
2620
jellyfish
Any of various free-swimming COELENTERATES having a disc- or bell-shaped body of jellylike consisten­cy. Many have long tentacles with nema... more
Any of various free-swimming COELENTERATES having a disc- or bell-shaped body of jellylike consisten­cy. Many have long tentacles with nematocysts (stinging cells). Some are capable of producing glowing ball LUMINESCENCE. Any jellylike free-floating organism. The term 'jel­lyfish' often is applied to the ctenophores and may be applied to certain tunicates. Also called medusa.