merycism
noun [ U ] medical specialized uk/meˈrɪs.ɪ.zəm/ us/ˈmer.ɪˌsɪz.əm/
（罕见）反刍症
a rare eating disorder in which someone, especially a child, swallows food, brings it back up from the stomach, and then chews it and swallows it again
Merycism is found mainly in young children and people with mental disabilities. 反刍症主要在儿童或有精神疾病的人中发生。