Today's words

I'm thankful for today's Dictionary Devil puzzle, which is making up in one day for the lack of new vocabulary this week from the Word of the Day feature:

eudaemonism \yü-ˈdē-mə-ˌni-zəm\ - a theory that the highest ethical goal is happiness and personal well-being

I knew that the concept of "good" had to appear in this definition somewhere. I fear I may be living with someone who embraces this philosophy. I was mispronouncing the second syllable, and probably continue to do so if I ever again encounter this word.

rhebok \ˈrē-ˌbäk\ - a brownish-gray antelope (Pelea capreolus) of southern Africa

It seems that I may have previously encountered this word at some point. I was also mispronouncing the first syllable of this word, but only because I didn't want to pronounce it like the shoe, which turns out to have gotten its name from the animal, so I have a chance of remembering how to pronounce this one the next time I see it. (I think I trust the "best answer" at that link for the source of the name Adidas more than either acronym that some of the other answers invoke.)

vagary \ˈvā-gə-rē; və-ˈger-ē, vā-; also ˈva-gə-rē\ - an erratic, unpredictable, or extravagant manifestation, action, or notion

Well, I actually knew this one, but had only seen it in plural form. I had a friend once with whom I used to disagree about pronunciations. When we looked them up, it always turned out we were both right, though I tended to use the preferred pronunciation and she tended to use an alternate one. Here's one of those words that I would have thought others were mispronouncing if I ever heard them use one of the alternate pronunciations.