isogram

[ahy-suh-gram]

i·so·gram

[ahy-suh-gram]
noun Meteorology, Geography.
a line representing equality with respect to a given variable, used to relate points on maps, charts, etc.
Also called isoline.


Origin:
1885–90; iso- + -gram1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Isogram is always a great word to know.
So is photochemical smog. Does it mean:
an area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution
air pollution containing ozone and reactive chemical compounds formed by sunlight on nitrogen oxides and hydrocarbons, often from auto exhaust
Collins
World English Dictionary
isogram (ˈaɪsəʊˌɡræm)
 
n
another name for isopleth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
isogram   (ī'sə-grām')  Pronunciation Key 
See isoline.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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