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Dia

Origin

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

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Dia is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...

Dictionary.com Unabridged

diameter.

Also, dia.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To Dia

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.

Through: diapedesis.
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.

American Heritage

Abbreviations & Acronyms

DIA