Abacus.
Do you pronounce it **a-back-us **or abba-kiss? I did a search and found both on vocal pronuciation pages. So I can’t tell which is correct. But I do have a beer riding on it and decided to bring it to the best and brightest. And yes, I am shamelessly pandering. 
Thanks in advance!
Checked a dictionary?
Split that beer – both pronunciations are equally correct. Many English words are that way, actually.
EDIT: any and all dictionary citations will show both pronunciations.
If this turns into an IMHO- I say Abbah-cuss.
They will also show the correct spelling for “pronunciation” (as compared to the thread title)
I did and found two different ways in two different dictionaries. AOL online dictionary has this ˈa-bə-kəs and my trusty Funk and Wagnalls shows it thisaway AB ə kəs. So no help there and that is why I thought I would go with majority rule.
I do agree that both are possibly right, and mentioned the Toe-may-toe, Toe-ma-to thing only to be booed down by the word opponent.
And heh, that naughty ‘n’ running away from me like that! Fie on it! 
Aren’t those both the same pronunciation? It just looks like they split the syllables differently, but both have the stress on the first syllable.
I cannot tell. I wish that both had done it the same way, as it would have made it easier for the one in the room(me) that has always had troubling deciphering those pronunciation codes.
Both have the accent on the first syllable, as far as I can tell, in your examples. One marks it with the accent mark preceding the syllable accented. The other marks it with capital letters.
However, one source giving both ABacus and aBACus as a pronuncation is here. I’ve only heard it pronounced with the accent on the first syllable.
Depends on where you live.
The OED (UK standard) and Macquarie (Australian standard) both offer only one pronunciation, with the stress on the first syllable. I suspect the pronunciation with the stress on the second syllable is found only in the US.
Those are both the same, and with rare exceptions that’s the way I’ve always heard it: accent on the first syllable.
By what I learned in grade school, splitting the first syllable to include the b would mean that the a is short (ab-), and excluding the b would be the a is long (a-). No clue if the dictionaries in question follow that convention, though.
I’ve never heard that before, but looking online here, which is what I get from trying to find an online AOL dictionary, I get " ˈa-bə-kəs" for the pronunciation, while “able” gives me " ˈā-bəl", with the macron showing the long English vowel sound. So, it seems short “a” is indicated in both examples given by the OP.
Dictionary.com will provide an audible pronunciation for you, just click on the icon following the spelling.
This is how I say it.
I’ve occasionally heard it with the accent on the second syllable, and always assumed (without proof) that this was the British way of saying it.
Nice catch jujuju.
Yeh, I pronounce it abbah-cuss. Like the first red audio icon at m-w.com.
But, apparently there’s a second pronunciation that I’ve never come across, which sounds like the OP’s first example (the 2nd red audio icon).
Where do you live, MizTina?
It’s toe-MAY-toe vs toe-MAH-toe. Or tuh-MAY-toe, as most Americans would say it. Except when they pronounce it tuh-MAY-tuh.