Some of the most salient differences among Arabic vernaculars have to do with syllable structure. This study focuses on the syllabification patterns of three dialect groups, (1) VC-dialects, (2) C-dialects, and (3) CV-dialects,1 and argues that they differ in the licencing of SEMISYLLA- BLES, moras unaffiliated with syllables and adjoined to higher prosodic constituents. The analysis provides some evidence for a constraint-based version of Lexical Phonology, which treats word phonology and sentence phonology as distinct constraint systems which interact in serial (...) fashion. (shrink)