You should thank to KKat for this thread:
http://www.abstractfonts.com/forum/thread/31556
or take a look at this extended info about Gentium
http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&item_id=Gentium_glyphs
(also available here)
http://www.abstractfonts.com/font/11389
What are the most common fonts used in dictionary entries? I know you guys will know.