Definition of dia- in English:

dia-

Syllabification: dia-
(also di- before a vowel)

prefix

1Through; across: diameter diaphanous diuretic
2Apart: diakinesis

Origin

from Greek dia 'through'.

Definition of dia- in:

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Word of the day anomalous
Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected