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A line drawn on a map connecting points that receive equal amounts of sunlight.

[iso- + Greek hēlios, sun; see sāwel- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physical Geography) a line on a map connecting places with an equal period of sunshine
[C20: from iso- + Greek hēlios sun]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈaɪ səˌhɛl)

a line on a weather map connecting points that receive equal amounts of sunshine.
[1900–05 <iso- + Greek hḗlios sun]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.isohel - an isogram connecting points receiving equal amounts of sunshine
isarithm, isogram, isopleth - a line drawn on a map connecting points having the same numerical value of some variable
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
PA line connecting the points on a weather map that receive equal amounts of sunshine is called an "isohel".
Back Disco was included in the worldwide blogger Music Alliance Pact for November and the duet, which features vocals from ex Isohels singer Claire Prendergast, draws from the bands American and Irish folk influences and takes a look at a typical Irish weekend on the town from the point of view of two newly acquainted partners/ Back Disco will be available on a 7" Vinyl and limited cd copies with the brand new B-side "Chelsea Bards" which was recorded in Rroom 325 of the Chelsea Hotel in New York City.