In version 2.2.3 a single quote in a definition gets a backslash added in front of it in the tooltip. I traced it to glossary.php:255:
$glossaryItemContent = addslashes($glossaryItemContent);
guessing that the intent is to make the content attribute-safe, I changed it to this to fix the issue:
$glossaryItemContent = esc_attr($glossaryItemContent);
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