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ptosis: Meaning and Definition of

pto•sis

Pronunciation: (tō'sis), [key]
— n. Pathol.
  1. a drooping of the upper eyelid.
  2. prolapse or drooping of any organ.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
ptomaine poisoning ptp.
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