falx
noun [ C ] anatomy specialized uk/fælks/ us/fælks/ falces uk/ˈfæl.siːz/ us/ˈfæl.siːz/
（拉丁语，用于医学术语中，指镰刀形的器官或结构）镰，镰形
a Latin word meaning "sickle" (= a tool with a curved C-shaped blade), used in the names of body parts that are shaped like a sickle
the cerebral falx (= part of the brain shaped like a C or sickle) 大脑镰