Isochore
noun ·Rare ·Advanced level
Definitions
- 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.
"The numerical results are given from which the authors deduce the relation for constant volume and additional reasons are given for believing acetic acid (whose vapour density at ordinary temperatures is abnormal) to be a mixture of C₂H₄O₂ and C₄H₈0₄, the former preponderating as the temperature rises. The authors ask the Society for a name to designate lines connecting pressure and temperature at constant volume, and for which they suggested “isochore”..."
- 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."
- 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."
- 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."
Example
More examples"The numerical results are given from which the authors deduce the relation for constant volume and additional reasons are given for believing acetic acid (whose vapour density at ordinary temperatures is abnormal) to be a mixture of C₂H₄O₂ and C₄H₈0₄, the former preponderating as the temperature rises. The authors ask the Society for a name to designate lines connecting pressure and temperature at constant volume, and for which they suggested “isochore”..."
Etymology
From iso- + Ancient Greek χώρα (khṓra, “place”).
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.