— see dich-
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a combining form meaning "in two parts," "in pairs," used in the formation of compound words: dichogamy.
[ < Gk, comb. form of dícha in two, asunder]
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dicho-a. Gr. διχο-, combining form of adv. δίχα in two, asunder, apart, as in διχοτοµία cutting in two. A first element in several scientific words, with the meaning, ‘asunder, separately, in two parts or halves’.
(The ι is short in Greek, so that the usual English pronunciation is not etymological.)
Useful english dictionary. 2012.