Ambisyllabic

A segment is ambisyllabic if it belongs to two syllables.

Example

The English word hammer cannot be divided into two syllables ha and mer; the [m] functions both as the final segment of the first syllable and as the initial consonant of the second syllable.

Link

Utrecht Lexicon of Linguistics

Reference

Kahn, Margaret 1976. Borrowing and variation in a phonological description of Kurdish. Diss. Ann Arbor, Univ. of Michigan.