dicho-comb. form
Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g.
dichotriaene n.Origin: A borrowing from Greek. Etymon: Greek διχο-.
Etymology: < ancient Greek διχο-, combining form (in e.g. διχοτομία dichotomy n.) of δίχα (adverb) in two, asunder, apart < δίς twice (see di- comb. form); compare -o- connective.Occasionally found in from the late 16th cent. in borrowings from post-classical Latin, French, and ancient Greek (compare dichotomy n. and dichostasy n.). Formations within English are found from the early 19th cent. (compare dichogamy n.). The usual pronunciation of the vowel in the first syllable English does not follow that in Greek, in which ι is short.
This entry has been updated (OED Third Edition, March 2014; most recently modified version published online September 2021).