Parenthese

[Benjamin Barrett]

Here is a video where the final -s is taken off "parentheses" to form the singular form "parenthese." 

There are about four instances starting at 3:30 on the video.

http://www.youtube.com/watch?v=1pzVPSSUrRA&feature=related

Benjamin Barrett
Seattle, WA
(signing off the list)
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The American Dialect Society - http://www.americandialect.org