Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym PSIS is...

PSIS is

Pesticide Safety Information Series
Population And Social Integration Section
Preparatory School For International Students
Poison Substance Information System

More Meanings For PSIS:

Pesticide Safety Information Series
Population And Social Integration Section
Preparatory School For International Students
Poison Substance Information System
Pounds Per Square Inch Sealed

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