Abbreviation for reticular activating system.
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radiologist aid system [digital mammography algorithm]; rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, availability, serviceability; remote access service; renal artery stenosis; renal artery stent; reninangiotensin system; residency application service; reticular activating system; rheumatoid arthritis serum; rotational atherectomy system; Rokitansky-Aschoff sinus; routine analysis station
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ras 'ras n, often attrib [rat sarcoma] any of a family of genes that undergo mutation to oncogenes and esp. to some commonly linked to human cancers (as of the colon, lung, and pancreas) <\ras oncogenes> <\ras proteins>
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renal artery stenosis; renin-angiotensin system.Medical dictionary. 2011.