Ptosis Definition
 tōsĭs 
  ptoses
  
    noun
  
 A prolapse, or falling of some organ or part; esp., the drooping of the upper eyelid, caused by the paralysis of its muscle.
 Webster's New World 
Other Word Forms of Ptosis
Noun
Singular:
 ptosisPlural:
 ptosesOrigin of Ptosis
-  
Greek ptōsis fall from piptein ptō- to fall pet- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Ancient Greek πτῶσις (ptōsis, “falling, a fall").
From Wiktionary
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