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I am running XOOPS 2.0.9.2 and PHP version 4.3.10.
When viewing a single word I can see the word itself in bold, the word Definition: in bold followed by nothing on the second line, then on the next line Reference: followed by the reference info.
So something is preventing the definition text itself, that is stored properly in the database, from showing only when viewing a single word from within the module itself. The definition shows properly in blocks.