octu-comb. form
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Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g.
octuple adj. and n.Origin: A borrowing from Latin. Etymons: Latin octu-, octo.
Etymology: < classical Latin octu-, combining form (in e.g. octuplus octuple adj.) of octo eight (see octo- comb. form).In English use probably after octuple adj. Found in a small number of formations from the mid 19th cent., apparently earliest in octuplet n.
This is a new entry (OED Third Edition, March 2004; most recently modified version published online September 2019).