isochasm

i·so·chasm

[ahy-suh-kaz-uhm]
noun Meteorology.
a line on a map or chart connecting points where auroras are observed with equal frequency.

Origin:
1880–85; iso- + chasm

i·so·chas·mic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Isochasm is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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