pelo-comb. form
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Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g.
pelophile n.Origin: A borrowing from Greek. Etymon: Greek πηλο-.
Etymology: < ancient Greek πηλο-, combining form (in e.g. πηλοβάτης : see pelobatid n. and adj.) of πηλός clay, mud, of unknown origin; compare -o- connective.Found in a small number of loans from scientific Latin from the late 19th cent., and also in occasional English formations such as pelolithic adj., pelotherapy n. Combining with second elements ultimately of Greek origin. Compare French pélo- (formations in which are attested from the mid 19th cent.: see pelophile n.). N.E.D. (1904) gives only the pronunciation (pīlo) /piːləʊ/ for the first element of compounds formed on pelo-. The position of the stress in such compounds varies in accordance with the general stress patterns of English. Contrastive stress may also give rise contextually to primary stress on the first syllable in compounds where stress ordinarily falls elsewhere.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2020).