ptosisn.
英 'təʊsɪs | 美 'tosɪs
中文n. [医] 下垂；上睑下垂；下垂症
词根词源
ptosis (n.)1743, from Greek ptosis, literally "falling, a fall," also "the case of a noun," nominal derivative of piptein "to fall" (see symptom). In English, especially of the eyelid. Related: Ptotic.
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