isopor

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noun

A line on a map that joins places of equal annual change in a geomagnetic property; an isoporic line.

OriginAncient Greek πόρος →
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Meanings

nounisopor (plural isopors)

plural isopors

  1. A line on a map that joins places of equal annual change in a geomagnetic property; an isoporic line.

    Mapping of the isopors, or lines of equal magnetic change, by the Department disclosed a large number of isoporic foci where the change in the magnetic elements is taking place most rapidly.

    1938, Cooperation in Research: Carnegie institution of Washington Publication no. 501

Origin

  1. Ancient Greekπόρος“journey”
  2. Englishisopor

From iso- + Ancient Greek πόρος (póros, “journey”), on the basis that isopors are "lines of equal travel".

More words from Ancient Greek

Full word history & related roots →
Cite this entry
APA

isopor. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/isopor

MLA

“isopor.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/isopor. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “isopor,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/isopor.

Source: isopor on Wiktionary, CC BY-SA 4.0.