isochasm

isochasm is defined in Webster's Unabridged Dictionary (1913) with 1 sense. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.A line connecting places on the earth's surface at which there is the same mean frequency of auroras.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

Related questions

Reverse-dictionary questions

Definition-first questions whose answer is isochasm.

Sources