[zey-tuh, zee-]


the sixth letter of the Greek alphabet (Z, ζ).
the consonant sound represented by this letter.

Nearby words

  1. zest,
  2. zester,
  3. zestful,
  4. zestfully,
  5. zesty,
  6. zeta sedimentation ratio,
  7. zeta-jones,
  8. zetacrit,
  9. zetetic,
  10. zethar

Origin of zeta

First recorded in 1820–30, zeta is from the Greek word zêta

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for zeta

British Dictionary definitions for zeta



the sixth letter in the Greek alphabet (Ζ, ζ), a consonant, transliterated as z

Word Origin for zeta

from Greek, of Semitic origin; compare Hebrew sādhē



(foll by the genitive case of a specified constellation) the sixth brightest star in a constellationZeta Tauri



a torus-shaped apparatus used for research in the 1950s and early 1960s on controlled thermonuclear reactions and plasma physics

Word Origin for ZETA

C20: from z (ero-) e (nergy) t (hermonuclear) a (pparatus)

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 zeta


Greek letter, see zed.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for zeta


[zātə, zē-]


The sixth 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.