
1) Water
Found on
https://www.crosswordclues.com/clue/phreatic

Phreatic is a term used in hydrology to refer to aquifers, in speleology to refer to cave passages, and in volcanology to refer to eruption type. ==Hydrology== The term phreatic is used in hydrology and the earth sciences to refer to matters relating to ground water (an aquifer) below the water table (the word originates from the Greek phrear, phr...
Found on
http://en.wikipedia.org/wiki/Phreatic

of, like or pertaining to underground water supplying or wells
Found on
http://phrontistery.info/p.html

• (a.) Subterranean; -- applied to sources supplying wells.
Found on
http://thinkexist.com/dictionary/meaning/phreatic/
Phre·at'ic adjective [ French
phréatique , from Greek ..., ..., a well.]
(Geol.) Subterranean; -- applied to sources supplying wells.
Found on
http://www.encyclo.co.uk/webster/P/78

[
adj] - of or relating to ground water
Found on
http://www.webdictionary.co.uk/definition.php?query=phreatic

phreatic Pertaining to, or related to, underground waters; especially, those at or below the water table and accessible through wells.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1648/
adjective of or relating to ground water
Found on
https://www.encyclo.co.uk/local/20974

(adjective) describes a cave, passage or cave system that formed below the water table and was consequently permanently flooded. The phreatic zone (or phreas) is the zone permanently saturated by water below the water table.
Found on
https://www.encyclo.co.uk/local/23001
No exact match found.