The Phrontistery

Books by Stephen Chrisomalis
Numerical Notation: A Comparative History Human Expeditions: Inspired by Bruce Trigger


Contour Lines (Isolines)

All right, you must think I'm off my rocker at last. Contour lines? This list of 60 nouns beginning with "iso" defines words for contour lines on maps and diagrams that connect points having some feature (climatic, geographic, etc.) in common - also known as isolines or isograms. I wouldn't have thought there were so many of them before undertaking this site, but now that I've found them, I've become rather attached to them.
     So, now for my anecdote about isograms. When I was in high school (in south-central Ontario, Canada), my friends and I developed a particular isogram known as 'the stupid line'. This line demarcated the point north of which congenital idiots were found in great frequency (i.e. redneck country). The phrase 'north of the stupid line' came to signify an individual of subnormal intelligence and general social ignorance. So, what do you think of "isomoron"? Let me know.

Word Definition
isabnormal line connecting points of equal deviation from mean temperature
isacoustic line connecting points of equal acoustic quality
isallobar line connecting points of equal change in barometric pressure
iseidomal line connecting points of equal visibility of a spectacle
isentropic line connecting points of equal entropy
isobar line connecting points of same atmospheric pressure
isobase line connecting points of equal land upheaval
isobath line connecting points of equal underwater depth
isobathytherm line connecting points of equal temperature and depth underground
isobront line connecting points of simultaneous storm development
isochar line connecting points of similar distinguishing characteristics of plant life
isochasm line connecting points of equal frequency of aurorae
isocheim line connecting points of same average winter temperature
isochlor line connecting points of equal chlorine concentration
isochor line connecting points of varying conditions under constant volume
isochrone line connecting points of equal time difference or simultaneous occurrence
isoclinal line connecting points of same magnetic dip
isocryme line connecting points of equal winter temperature
isodose line connecting points that receive equal doses of radiation
isodrosotherm line connecting points of equal dew point
isodynamic line connecting points of equal magnetic intensity
isoflor line connecting points of equal number of plant species
isogam line connecting points of equal acceleration due to gravity
isogen line connecting points of equal birthrates
isogeotherm line connecting points of equal subterranean temperature
isogloss line connecting points of similar regional dialect
isogon line connecting points of same specified angle or same wind direction
isogonal line connecting points of equal magnetic declination
isograd line connecting points of similar conditions during geological metamorphism
isogram line connecting points on a map having some similar feature
isograph line connecting points of same linguistic usage in some respect
isohaline line connecting points of equal salinity
isohalsine line connecting points of equal ocean salinity
isohel line connecting points of equal sunlight
isohyet line connecting points of equal rainfall
isokeraunic line connecting points of equal occurrence of thunderstorms
isolex line connecting points of same vocabulary usage
isoline line connecting points on a map having some similar feature
isomagnetic line connecting points of equal magnetic induction
isometric line connecting points of equal variations of pressure
isomorph line connecting points of same linguistic morphological forms
isonephelic line connecting points of equal cloud cover
isopach line connecting points of equal thickness of geological strata
isophene line connecting points of the same phenotype or seasonal variation
isophote line connecting points of equal light intensity from a given source
isopiestic line connecting points of equal pressure but varying temperature and volume
isopiptesis line connecting points of same arrival date of migratory species
isopleth line connecting points of equal aspect of climate
isopor line connecting points of equal annual change in magnetic field
isopycnic line connecting points of equal density
isorithm line connecting points of equal population density
isoseismal line connecting points of same earthquake intensity
isostere line connecting points of equal specific volume of a substance
isotac line joining points where the ice melts at the same time of year
isotach line connecting points of the same wind speed
isothere line connecting points of equal summer temperature
isotherm line connecting points of equal temperature
isothermobath line connecting points of equal temperature at a given ocean depth
isotherombrose line connecting points of equal ratio of summer rainfall to annual rainfall
isovol line connecting points of equal ratio of fixed to volatile carbon in coal


I hope you have found this site to be useful. If you have any corrections, additions, or comments, please contact me. Please note that I am not able to respond to all requests. Please consult a major dictionary before e-mailing your query. All material on this page © 1996-2013 Stephen Chrisomalis. Links to this page may be made without permission.

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