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xi

[ zahy, sahy; Greek ksee ]
/ zaɪ, saɪ; Greek ksi /
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noun, plural xis.

the 14th letter of the Greek alphabet (Ξ, ξ).
the group of consonant sounds represented by this letter.

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

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British Dictionary definitions for xi (1 of 2)

xi
/ (zaɪ, saɪ, ksaɪ, ksiː) /

noun plural xis

the 14th letter in the Greek alphabet (Ξ, ξ), a composite consonant, transliterated as x

British Dictionary definitions for xi (2 of 2)

Xi

Hsi or Si

/ (ʃiː) /

noun

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

Medical definitions for xi (1 of 2)

xi
[ zī, sī, ksē ]

n.

The 14th letter of the Greek alphabet.

Medical definitions for xi (2 of 2)

ξ

The Greek letter xi. Entries beginning with this character are alphabetized under xi.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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