A line on a map connecting points on the Earth where metamorphism of rocks occurred under the same pressure and temperature conditions. These lines are established on the basis of the distribution of index minerals and are useful in reconstructing the tectonic history of a given region.


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    [ahy-suh-grey-dee-uh nt] /ˌaɪ səˈgreɪ di ənt/ noun, Meteorology. 1. a line on a weather map or chart connecting points having the same horizontal of a meteorological quantity, as temperature, pressure, or the like.

  • Isograft

    [ahy-suh-graft, -grahft] /ˈaɪ səˌgræft, -ˌgrɑft/ noun, Surgery. 1. . isograft i·so·graft (ī’sə-grāft’) n. See syngraft.

  • Isogram

    [ahy-suh-gram] /ˈaɪ səˌgræm/ noun, Meteorology, Geography. 1. a line representing equality with respect to a given variable, used to relate points on maps, charts, etc. /ˈaɪsəʊˌɡræm/ noun 1. another name for isopleth isogram (ī’sə-grām’) See isoline.

  • Isograph

    [ahy-suh-graf, -grahf] /ˈaɪ səˌgræf, -ˌgrɑf/ noun 1. (in the study of the geographical distribution of a dialect) a line drawn on a map to indicate areas having common linguistic characteristics.

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