Google -> define: psi

Refers to the unit of measure of pressure Pounds per Square Inch.
www.egl-neon.com/glossary.htm

pounds per square inch; a common measurement of air pressure.
http://www.lakesidepress.com/pulmona...a/sectionq.htm

Pounds per square inch, the common unit of measurement for pressure. Normal atmospheric pressure at sea level is 14.7 psi.
www.parttrackers.com/auto_glossary/pq/

Abbreviation for pounds per square inch.
www.ssqi.com/Library/glossary.html

Pounds per square Inch.
www.newyorkerboiler.com/glossary.cfm

Indicator of one or more pollutants that may be used to inform the public about the potential for adverse health effects from air pollution in major cities.
www.epa.gov/OCEPAterms/pterms.html

Pounds per square inch.
www.solutionsforpower.com/glossary.html

Pounds per square inch. A unit of pressure. At sea level, the earth's atmosphere exerts 14.7 psi.
www.dhs.ca.gov/ohb/HESIS/utsgloss.htm

Measure of the load pressure of one commodity on another. Atmospheric pressure at sea level is 14.696 psi with Fluid pressure (liquid & gas) being measured in terms of pounds per square inch absolute or pounds per square inch gauge.
www.yourwebassistant.net/glossary/p15.htm

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