Zygolablalis is not a common word, but it can be broken down phonetically as /zaɪ.ɡoʊ.læb.ə.lɪs/. The "zygo" prefix means "related to joining or pairing," while "labia" refers to "lip-like structures." The suffix "-alis" signals that the word is an adjective. Therefore, the word "zygolabialis" might mean relating to lips that are joined or paired in some way. In any case, the challenge of spelling this word highlights the benefits of phonetic transcription, which can help us understand the sounds and structures of words in greater detail.
The caput zygomaticum of the musculus quadratus labii superioris, or musculus zygomaticus minor.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.