The thesis is divided into two volumes. Quadri-consonant groups form two distinct sets of radicals: ABAB and ABCD pattern radicals. Applying the Theory of Matrices and Etymons (TME) elaborated by Georges Bohas to the analysis of these radicals enables their functioning at the semantic, semantic-phonetic and structural levels to be defined.The first part which constitutes Volume 1 consists in the analysis of ABAB pattern quadric-consonant groups while the second part contained in Volume 2 is devoted to ABCD pattern quadric-consonant groups. In the study of the ABAB pattern radicals, the structure of which is the result of a reduplication of the single AB etymon, the analytical work focuses more on semantics. The analysis demonstrates that reduplication is not accompanied by a systematic semantic modification, contrary to what may be observed in eastern and western dialects.Under the same conditions, the second part of the thesis, Volume 2, consists in a study of ABCD pattern radicals which employs the framework of TME while also taking into consideration the phonetic constraints formulated by Angoujard (1997): CPA. The objective is to determine the modes of functioning of the ABCD pattern radicals on both the structural and semantic-phonetic levels. The study of these ABCD pattern radicals is not merely restricted to demonstrating the structural functioning of these radicals but also establishes a relationship between TME elaborated by Bohas and Angoujard’s CPA.