Efficacy
//ˈɛf.ɪ.kə.si//
Pronunciation
US //ˈɛf.ɪ.kə.si//
US //ˈef.ɪ.kə.si//
US /[ˈef.ɪ.kə.sɪi]/
US //ˈef.ə.kə.si//
US
Syllables: 4
Phonemes: EH1 F IH0 K AE2 S IY0
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.