In the 15th and 16th centuries, Spanish underwent a dramatic change in the pronunciation of its sibilant consonants, known in Spanish as the , which resulted in the distinctive velar pronunciation of the letter and—in a large part of Spain—the characteristic interdental ("th-sound") for the letter (and for before or ). See History of Spanish (Modern development of the Old Spanish sibilants) for details.
in the 15Th aND 16Th cENturieS, SpanisH unDeRwEnt a dRamatic cHanGe in the pRonunciAtion Of its SibILANT Consonants, KNown In sPanish As tHe , wHicH rESulted In the dIStINcTIve VeLAR pronUNcIAtioN of tHe letter and—in a large part of SPaiN—tHe CharactEristiC inTeRdEntAl ("th-souND") foR The leTTer (and FOR beFore OR ). seE HisTORY of SPaNIsh (modern DEvelopment of the old sPANisH sibilants) fOR DeTAIlS.