triliteral

Triliteral, trī-lit′ėr-al, adj. consisting of three letters.

We can recognise any Semitic dialect by the triliteral character of its roots.

Words like pity might be made triliteral (triconsonantal) by doubling the tt; words like pitted, by ejecting it.

Triliteral and Multiliteral Propositions (such as “All abc are de”).

As Egyptian roots seldom exceeded three letters, there was no need for triliteral phonograms to spell them.