Definition of "ptosis" [pto•sis]

• Abnormal lowering or drooping of an organ or a part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""The thing you're going to really see, with people doing their own Botox, you're gonna see a lot of uneven eyebrows and you're gonna see a lot of what we call ptosis, where the eyelids drop.""
• "Did you know that "ptosis" is Latin for "period of the face?""
• "This being smize week, you can see how her ptosis might be a problem."