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[pahy-seez, pis-eez]
noun, genitive Pis·ci·um [pish-ee-uh m] /ˈpɪʃ i əm/, for 1.
  1. Astronomy. the Fishes, a zodiacal constellation between Aries and Aquarius.
  2. Astrology.
    1. the twelfth sign of the zodiac: the mutable water sign.
    2. a person born under this sign, usually between February 19th and March 20th.
  3. the class of vertebrates comprising the fish and sometimes including, in certain classifications, the cyclostomes.
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Origin of Pisces

< New Latin, Latin piscēs, plural of piscis fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for pisces


noun Latin genitive Piscium (ˈpaɪsɪəm)
  1. astronomy a faint extensive zodiacal constellation lying between Aquarius and Aries on the ecliptic
  2. astrology
    1. Also called: the Fishesthe twelfth sign of the zodiac, symbol ♓, having a mutable water classification and ruled by the planets Jupiter and Neptune. The sun is in this sign between about Feb 19 and March 20
    2. a person born when the sun is in this sign
    1. a taxonomic group that comprises all fishesSee fish (def. 1)
    2. a taxonomic group that comprises the bony fishes onlySee teleost
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  1. astrology born under or characteristic of Pisces
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Also (for senses 2b, 4): Piscean (ˈpaɪsɪən)

Word Origin

C14: Latin: the fishes
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 pisces



12th sign of the zodiac, late Old English, from Latin pisces, from plural of piscis "a fish," cognate with Gothic fisks, Old English fisc (see fish (n.)). Applied to persons born under this sign from 1924.

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Online Etymology Dictionary, © 2010 Douglas Harper

pisces in Science


  1. A constellation in the Northern Hemisphere near Aries and Pegasus. Pisces (the Fishes) is the twelfth sign of the zodiac.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.