Dictionary.com
definitions
  • synonyms

dia-

See more synonyms on Thesaurus.com
  1. 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 of dia-

< 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 Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for dia-

dia-

di-

prefix
  1. through, throughout, or duringdiachronic
  2. acrossdiactinic
  3. apartdiacritic
  4. (in botany) at right anglesdiatropism
  5. in opposite or different directionsdiamagnetism

Word Origin

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

Word Origin and History for dia-

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."

Online Etymology Dictionary, © 2010 Douglas Harper

dia- in Medicine

dia-

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.

dia- in Science

dia-

  1. 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.

  • About
  • Cookies, Terms, & Privacy
© 2018 Dictionary.com, LLC.