Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
PTN
PTO
Ptolemaeus
Ptolemaic
Ptolemaic system
Ptolemaist
ptomaine
ptomaine poisoning
ptosis
pts.
PTSD
PTV
Pty.
ptyalin
ptyalism
Pu
pub
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

ptosis
pto·sis [ tṓssiss ] (plural pto·ses [ tṓ sz ])


noun 
Definition:
 
drooping of eyelid: a drooping of the upper eyelid, resulting from muscle weakness or an inability to move muscles
[Mid-18th century. < Greek ptōsis "a falling" < piptein "to fall"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
Advertisement
© 2009 Microsoft