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dia-

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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).
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Also especially before a vowel, di-.

Origin of dia-

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

Other definitions for dia- (2 of 2)

dia.

abbreviation
diameter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use dia- in a sentence

British Dictionary definitions for dia-

dia-

di-


prefix
through, throughout, or duringdiachronic
acrossdiactinic
apartdiacritic
(in botany) at right anglesdiatropism
in opposite or different directionsdiamagnetism

Word Origin for dia-

from Greek dia through, between, across, by
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for dia-

dia-

pref.
Through:diapedesis.
Across:diameter.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for dia-

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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