RAS is an abbreviation for:

Return Activated Sludge

Governmental » Environmental

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Definition

What does RAS mean?

reticular activating system, RAS(noun)
the network in the reticular formation that serves an alerting or arousal function

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"RAS." Abbreviations.com. STANDS4 LLC, 2013. Web. 6 Dec. 2013. <http://www.abbreviations.com/term/396085>.

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