The pronunciation of œ is most of the time the same as eu, especially in words with œu but not only - œuf, cœur, bœuf, sœur, œuvre, m̄œurs (open) and vœux, nœud, œdème (closed) - œillet, œnologue, œil Sometimes you pronounce it é - fœtus, phœnix, Note : œnologue, œdème : are a priori é but most people will say eu. If it is a true oe and not an œ then the o is most of the time pronounced But it can also be oi - poêle (pwal), moelle (mwal), couenne (kwan) [sometime you can here people say pah-yel for poêle, it comes from old french paielle ]. http://monsu.desiderio.free.fr/curiosites/ligat-oe.html

There are two types of this sound: open and closed. To make the difference, you have basically to open your mouth more or less wide. Eu is OPEN when it is followed by a pronounced vowel (e.g. jeune, fleur...). Eu is CLOSED when it is NOT followed by a pronounced vowel (e.g. heureux, lieu...) or if it spelled like eû (e.g. jeûne). Check out this site, you might find it helpful: http://phonetique.free.fr/indexphonvoy.htm