n, pl  -la   :  the anterior inferior part of the forebrain that is chiefly concerned with olfaction and that is considered to include the olfactory bulb together with the forebrain olfactory structures receiving fibers directly from it and often esp. formerly the limbic system which is now known to be concerned with emotional states and affect - called also smell brain  rhin*en*ce*phal*ic adj 
 
   
 
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