1
                    
                                          
              
          
                                                      : a fine sharp process or projection                                      
                
                                
            especially                
          
                                                      : a sharp pointed emergence arising from the epidermis or cortex (see cortex sense 3a) of a plant (such as a rose or raspberry)   compare spine, thorn                                      
            
            2
                    
                                          
              
          
                                                      : a prickling or tingling sensation                                      
                
                    
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  Merriam-Webster unabridged




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