penultima
/pɪˈnʌltɪmə/ /pɛˈnʌltɪmə/noun
Grammar and Prosody. The penultimate syllable of a word or foot.
Origin
Late Middle English (in an earlier sense). From classical Latin paenultima, feminine of paenultimus. In sense B. 1 from classical Latin paenultima, use as noun (short for paenultima syllaba) of paenultima, adjective.