This is just a straight up [aU] diphthong, one syllable, in virtually every dictionary you can find. Certainly all the ones that use IPA. Same in my compact OED

This is just a straight up [aU] diphthong, one syllable, in virtually every dictionary you can find. Certainly all the ones that use IPA. Same in my compact OED (the tiny-print one that comes with a magnifying glass).