This article examines (in)definiteness in Mississippi Gulf Coast French (MGCF), a colonial variety spoken in Delisle (USA). MGCF has survived into the 20th century despite strong English influence and minimal number inflection. The study focuses on how countability is expressed through interactions at the phonology-syntax interface. In particular, it analyzes floating consonants such as [z], which surface in liaison contexts and become lexicalized i noun onsets. These segments function as morphophonological markers of countability and quantity. The paper argues that such features are encoded syntactically but realized phonologically. MGCF encodes mass-count distinctions without overt inflection, relying on templatic and lexical strategies. The findings support a feature-driven model of nominal classification in contact varieties.