triliteral

Etymology

tri- (“three”) + Latin litera (“letter”) + -al.

adj

1. Of word roots in Afroasiatic languages: consisting of three letters.
   [T]he philologist may well refuse to accept a body of triliteral roots, developed on a highly artificial and uniform plan, as the ultimate fact in Semitic lexicography. 13 December 1911, C. J. Ball, “A Study in Biblical Philology”, in Proceedings of the Society of Biblical Archæology, volume XXXIII, number CCXLIX, London: Society of Biblical Archaeology, →OCLC, page 13

noun

1. A word root in an Afroasiatic language that consists of three letters.