A truncation search feature provides the ability to search for variant words or spellings. Sometimes called a wildcard, this is a standard search feature found on many search engines; however, different search engines may use a different truncation or wild card symbol. New searchers may overlook this feature, while more experienced users may forget which truncation symbol is used on different search engines. But for those searchers trying to increase their searching knowledge and expertise, truncation can be a useful, though tricky feature. This article discusses the specific consequences of using truncation in PubMed:

http://www.nlm.nih.gov/pubs/techbull/jf06/jf06_skillkit.html

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