Smile
This article is about a smile as a physiological phenomenon. For information on the album, see Smile (album).In physiology, a smile is a facial expression formed by flexing muscles near both ends of the mouth. Customarily, it is an expression of pleasure or amusement.
References
- Miller, Professor George A., et. al. Overview for "smile." Retrieved Dec. 12, 2003 from http://www.cogsci.princeton.edu/cgi-bin/webwn?stage=1&word=smile
