Examples from the Web for triliteral
Triliteral and Multiliteral Propositions (such as “All abc are de”).Symbolic Logic|Lewis Carroll
We can recognise any Semitic dialect by the triliteral character of its roots.Chips From A German Workshop - Volume I|Friedrich Max Mller
Triliteral, trī-lit′ėr-al, adj. consisting of three letters.
As Egyptian roots seldom exceeded three letters, there was no need for triliteral phonograms to spell them.