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There is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as
- any geothermal spring 
- a spring with water temperatures above its surroundings 
- a spring with water temperatures above 50 °C (122 °F) 
- a natural spring with water temperature above body temperature – normally between 36.5 and 37.5 °C (97.7 and 99.5 °F) 
- a natural spring of water greater than 21.1 °C (70 °F) (synonymous with thermal spring) 
- a natural discharge of groundwater with elevated temperatures 
Sources of heat
- "MSN Encarta definition of hot spring". Archived from the original on 2009-11-01. https://www.webcitation.org/5kwr3UrtU?url=http://encarta.msn.com/encnet/features/dictionary/DictionaryResults.aspx?refid=1861692101.
- Miriam-Webster Online dictionary definition of hot spring
- For example, ambient ground temperature is usually around 55–57 °F (13–14 °C) in the eastern United States
- US NOAA Geophysical Data Center definition
- Wordsmyth definition of hot spring
- American Heritage dictionary, fourth edition (2000) definition of hot spring
- Infoplease definition of hot spring
- Random House Unabridged Dictionary, © Random House, Inc. 2006. definition of hot spring
- Allan Pentecost, B. Jones, R.W. Renaut (2003). "What is a hot spring?". Can. J. Earth Sci. 40 (11): 1443–6. . http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cjes_e03-083_40_ns_nf_cjes. provides a critical discussion of the definition of a hot spring.
- Wordnet 2.0 definition of hot spring
- Ultralingua Online Dictionary definition of hot spring
- Rhymezone definition of hot spring
- Lookwayup definition of hot spring
- Columbia Encyclopedia, sixth edition, article on hot spring