before vowels, di-, word-forming element meaning "through, thoroughly, entirely," from Greek dia-, from dia "through, throughout," probably from the root of duo "two" (see two) with a base sense of "twice."
dia- or di-
pref.
Through: diapedesis.
Across: diameter.
dia- A prefix meaning "through" or "across," as in diameter, the length of a line going through a circle. |