exa

exa-

a combining form used in the names of units of measure equal to one quintillion (10 18 ) of a given base unit: exabyte.

Origin:
probably ≪ Greek exō- outside, out of

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Collins
World English Dictionary
exa-
 
prefix
E denoting 1018: exametres

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

exa- pref.
One quintillion (1018): exagram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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