A ridge or fold, such as the rugae of the stomach, which are large folds in the mucous membrane of that organ. [ http://en.wikipedia.org/wiki/Rugae http://medical-dictionary.thefreedictionary.com/Rugal+folds ]

This is just here as a test because I lose it

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editor note

As currently defined this encompasses only mucuous membranes, and not for example rugal folds of skin such as the scrotal rugae



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