brain hormone
noun
1
                    
                                          
              
          
                                                      : a hormone that is secreted by neurosecretory cells of the insect brain and that stimulates the prothoracic glands to secrete ecdysone                                      
                
                    
2
                    
                                          
              
          
                                                      : any of various hormones (such as serotonin) produced in or acting on the vertebrate brain or central nervous system                                      
                
                  —not usually used technically
    
                
                    
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  Merriam-Webster unabridged




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