dia-

dia-

a prefix occurring in loanwords from Greek (diabetes; dialect) and used, in the formation of compound words, to mean “passing through” (diathermy), “thoroughly,” “completely” (diagnosis), “going apart” (dialysis), and “opposed in moment” (diamagnetism).
Also, especially before a vowel, di-.

Origin:
< Greek, combining form representing diá (preposition) through, between, across, by, of, akin to dýo two and di- di-1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Dia- is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Collins
World English Dictionary
dia- or di-
 
—prefix
1.  through, throughout, or during: diachronic
2.  across: diactinic
3.  apart: diacritic
4.  (in botany) at right angles: diatropism
5.  in opposite or different directions: diamagnetism
 
[from Greek dia through, between, across, by]
 
di- or di-
 
—prefix
 
[from Greek dia through, between, across, by]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

dia-
before vowels, di-, prefix meaning "through, thoroughly, entirely," from Gk. dia-, from dia "through, throughout," probably from the root of duo "two" (see two) with a base sense of "twice."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dia- or di-
pref.

  1. Through: diapedesis.

  2. Across: diameter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dia-  
A prefix meaning "through" or "across," as in diameter, the length of a line going through a circle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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