Noah Webster
Triliteral
TRILIT'ERAL, adjective [Latin tres, three, and litera, letter.] Consisting of three letters; as a triliteral root or word.
TRILIT'ERAL, noun A word consisting of three letters.
TRILIT'ERAL, adjective [Latin tres, three, and litera, letter.] Consisting of three letters; as a triliteral root or word.
TRILIT'ERAL, noun A word consisting of three letters.