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From http://www.mediawiki.org/wiki/Extension:Glossary#Escaping_forward_slashes_for_PCRE_functions

On line 82 within the glossaryParseThisNode function, the following code exists:

    $texts = preg_split('/\b(' . preg_quote($term) . 's?)\b/iu', $node->textContent, -1, PREG_SPLIT_DELIM_CAPTURE);

preg_quote() is meant to escape special regular expression characters from glossary terms. However by default it will not escape the forward slash character that has special meaning in PCRE regular expression functions. You will therefore need to change line 82 to:

    $texts = preg_split('/\b(' . preg_quote($term, '/') . 's?)\b/iu', $node->textContent, -1, PREG_SPLIT_DELIM_CAPTURE);

Without this fix, glossary terms containing a forward slash may cause a lot of rendering errors that make your MediaWiki installation unusable.