Undulant zinci extensum is a scientific term that describes a particular crystalline form of zinc. The word consists of several challenging sounds, making it difficult to spell accurately. The IPA (International Phonetic Alphabet) transcription of this term is /ʌnˈdjuːlənt ˈzɪŋkai ɛkˈstɛnsəm/. The first part, "undulant," is pronounced "uhn-DOO-luhnt." The second part, "zinci," is pronounced "ZING-kai." Finally, "extensum" is pronounced "ek-STEN-suhm." The term is frequently used in the field of chemistry to refer to a specific form of zinc that has unique properties.
Zinc salve mull, mulla zinci (N.F.).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.