Try Our Apps


Blech. These are the grossest words.


[zahy, sahy; Greek ksee] /zaɪ, saɪ; Greek ksi/
noun, plural xis.
the 14th letter of the Greek alphabet (Ξ, ξ).
the group of consonant sounds represented by this letter. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for xi
Contemporary Examples
Historical Examples
British Dictionary definitions for xi


/zaɪ; saɪ; ksaɪ; ksiː/
noun (pl) xis
the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x


a river in S China, rising in Yunnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)
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
Cite This Source
Word Origin and History for xi

fourteenth letter of the Greek alphabet.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
xi in Medicine

xi (zī, sī, ksē)

Symbol ξ The 14th letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
xi in Technology

A VLSI design language.
["The Circuit Design Language Xi", S.I. Feldman, unpublished memo, Bell Labs, 1982].
[Mentioned in Computational Aspects of VLSI, J.D. Ullman, CS Press 1984].

The Free On-line Dictionary of Computing, © Denis Howe 2010
Cite This Source
Related Abbreviations for xi


ex interest
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for xi

Many English speakers likely know this word

Word Value for xi

Scrabble Words With Friends

Nearby words for xi