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

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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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