subsyllabic

From sub- +‎ syllabic.

subsyllabic (comparative more subsyllabic, superlative most subsyllabic)

1. (linguistics) Of, or related to parts or fractions of a syllable.
   • 2002, Ludo Verhoeven, Carsten Elbro, Pieter Reitsma, editors, Precursors of Functional Literacy‎^[1]:

     While we assume that phonological subsyllabic units are functional prior to reading skill, we have not ruled out a possible interaction with the writing system.