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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 pto·sis /ˈtosəs/
 下垂症

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 pto·sis /ˈtosəs/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 Pto·sis n.  Med. Drooping of the upper eyelid, produced by paralysis of its levator muscle.
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From: WordNet (r) 2.0

 ptosis
      n : drooping of the upper eyelid caused by muscle paralysis and
          weakness
      [also: ptoses (pl)]