| ARAS | ascending reticular activating system |
|---|---|
| LRN | lateral reticular nucleus |
| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
| REM | rapid eye movement; recent-event memory; reticular erythematous mucinosis; return electrode monitor;... |
| RET | reticular; reticulocyte; retina; retention; retained; right esotropia |