isochore

noun4

1. •
   In general, a place or position with relevant parameters matching other places, as in having the same pressure, chemistry, population etc. Even within a single discipline the parameter might vary according to convenience e.g. in physics alone it might refer to velocity, volume, gravity, and many more. cf. contour, isopleth.
2. •
   A line drawn on a graph showing the variation of the pressure of a constant volume of gas as it varies with temperature.

   • An isochore is a curve on a PVT diagram, the pressure and temperature being variable, the volume invariable. — 1916
3. •
   A contour showing points of equal vertical thickness of strata; equal to an isopach if strata are horizontal.

   • The isochore plan of the overburden thus obtained is then placed over the isochore plan of the seam. — 1964
4. •
   A sequence of DNA that has a reasonably constant proportion of pairs of guanine and cytosine bases, and is rich in genes.

   • A model that accounts for the differential recognition of transgenes integrated at different chromosomal locations, is the isochore hypothesis. — 1998