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Sibilant loss in Northern Greek

Words which in southern Greek dialects contain [azis], [úsis], and other sequences of stressed vowel + sibilant + [i] + sibilant, appear widely in the north with [áys], [úys] etc., and the phenomenon constitutes a major crux in modern Greek phonology. Although the problem has been widely discussed, no really satisfactory solution based on attested processes has been offered. It is the purpose of this paper to review the data, criticize existing treatments, and offer a new proposal.