hemidemisemiquaver

Thanks, tsuwm, that was one of the words that had me wondering. Is it possible that the three have each carved out a niche, or even a hemidemiseminiche? For instance, hemiparesis is a medical term, while to me, demi often as an air of the diminutive about it, as in demitasse. Semi seems to be the most common in everyday English, or at least in everyday Zild. Does the OED have anything to offer on this?