Triliteral :: Triliteral (a.) Consisting of three letters; trigrammic; as, a triliteral root or word..
Triliteralness :: Triliteralness (n.) The quality of being triliteral; as, the triliterality of Hebrew roots..
Trilithon :: Trilithon (n.) A monument consisting of three stones; especially, such a monument forming a kind of doorway, as among the ancient Celts..