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pseudo-

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  1. 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).
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Also especially before a vowel, pseud-.

Origin of pseudo-

< Greek, combining form of pseudḗs false, pseûdos falsehood
Can be confusedpseudo- quasi-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pseudo-

pseudo-

sometimes before a vowel pseud-

combining form
  1. false, pretending, or unauthenticpseudo-intellectual
  2. having a close resemblance topseudopodium
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Word Origin

from Greek pseudēs false, from pseudein to lie
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 pseudo-

often before vowels pseud-, word-forming element meaning "false; feigned; erroneous; in appearance only; resembling," from Greek pseudo-, comb. form of pseudes "false, lying; falsely; deceived," or pseudos "falsehood, untruth, a lie," both from pseudein "to deceive, cheat by lies."

Productive in compound formation in ancient Greek (e.g. pseudodidaskalos "false teacher," pseudokyon "a sham cynic," pseudologia "a false speech," pseudoparthenos "pretended virgin"), it began to be used with native words in Middle English.

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Online Etymology Dictionary, © 2010 Douglas Harper

pseudo- in Medicine

pseudo-

pref.
  1. False; deceptive; sham:pseudohematuria.
  2. Apparently similar:pseudomyxoma.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.