di Definition
a prefix occurring in loanwords from Greek, where it meant “two,” “twice,” “double” (diphthong); on this model, freely used in the formation of compound words (dicotyledon; dipolar) and in chemical terms (diatomic; disulfide)..
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Summary: di in Brief
The prefix 'di' [dē] comes from Greek and means 'two,' 'twice,' or 'double.' It is used in compound words and chemical terms to indicate two or double.
