Definition of di- in English:

di-

Pronunciation: /dʌɪ, di/

combining form

1Twice; two-; double: dichromatic
1.1 Chemistry Containing two atoms, molecules, or groups of a specified kind: dioxide

Origin

from Greek dis 'twice'.

Definition of di- in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something