not actually but having the appearance of; pretended; false or spurious; sham.
almost, approaching, or trying to be.

1940–45; independent use of pseudo- Unabridged


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 (ˈsjuːdəʊ)
informal not genuine; pretended

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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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."

as a stand-alone, "false, spurious;" see pseudo-.
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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Computing Dictionary

pseudo definition

/soo'doh/ (Usenet) Pseudonym.
1. An electronic-mail or Usenet persona adopted by a human for amusement value or as a means of avoiding negative repercussions of one's net.behaviour; a "nom de Usenet", often associated with forged postings designed to conceal message origins. Perhaps the best-known and funniest hoax of this type is BIFF.
2. Notionally, a flamage-generating AI program simulating a Usenet user. Many flamers have been accused of actually being such entities, despite the fact that no AI program of the required sophistication yet exists. However, in 1989 there was a famous series of forged postings that used a phrase-frequency-based travesty generator to simulate the styles of several well-known flamers; it was based on large samples of their back postings (compare Dissociated Press). A significant number of people were fooled by the forgeries, and the debate over their authenticity was settled only when the perpetrator came forward to publicly admit the hoax.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Many buyers who pay for fake degrees want the pseudo-credentials so they can
  trick an employer, but others are scammed.
Its point of view is deftly sharpened, its manner is urbane and charming,
  without posture or allegorical pseudo-romantics.
Fiction is one giant pseudo-statement, a fact-checker's nightmare.
One of the villagers had opened a workshop manufacturing pseudo-antique
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