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1. ˈhemi-ˌdemi-ˈsemi, prefix View full entry 1929
...used as adj. and sometimes as a combining form in imitation of the use in hemidemisemiquaver (s.v. hemi-)....
2. nor-, prefix View full entry 1909
...Prefixed to the names of organic compounds to denote the replacement of one or (esp. in terpenes) all the (methyl) side chains by hydrogen atoms....
