a combining form meaning “false,” “pretended,” “unreal,” used in the formation of compound words (pseudoclassic; pseudointellectual ): in scientific use, denoting close or deceptive resemblance to the following element (pseudobulb; pseudocarp ), and used sometimes in chemical names of isomers (pseudoephedrine ).
Also, especially before a vowel, pseud-.

< Greek, combining form of pseudḗs false, pseûdos falsehood

pseudo-, quasi-. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pseudo- or (sometimes before a vowel) pseud-
combining form
1.  false, pretending, or unauthentic: pseudo-intellectual
2.  having a close resemblance to: pseudopodium
[from Greek pseudēs false, from pseudein to lie]
pseud- or (sometimes before a vowel) pseud-
combining form
[from Greek pseudēs false, from pseudein to lie]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

comb. form meaning "false, feigned, erroneous," from Gk. pseudo-, comb. form of pseudes "false," or pseudos "falsehood," both from pseudein "to deceive."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pseudo- or pseud-

  1. False; deceptive; sham: pseudohematuria.

  2. Apparently similar: pseudomyxoma.

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