leiomyoma
noun [ C ] medical specialized uk/ˌleɪ.əʊ.maɪˈəʊ.mə/ us/ˌleɪ.oʊ.maɪˈoʊ.mə/
平滑肌瘤
a benign tumour (= one that is not likely to cause death) of muscle tissue, especially in the uterus (= the organ in a woman's body where a baby develops)