tri·lit·er·al
                    
                                                                                                              
                                                                                                                                  (ˌ)trī-ˈli-t(ə-)rəl 
                                                      
                                                          
            
                                
              
          
                                                      : consisting of three letters and especially of three consonants                                      
              
                             
triliteral roots in Semitic languages
                         
                
                    
                                
              
          
                                                      : a root or word that is triliteral                                      
                
                    
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