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-oid

1.
a suffix meaning “resembling,” “like,” used in the formation of adjectives and nouns (and often implying an incomplete or imperfect resemblance to what is indicated by the preceding element):
alkaloid; anthropoid; cardioid; cuboid; lithoid; ovoid; planetoid.
Compare -ode1 .
Origin
< Greek -oeidēs, equivalent to -o- -o- + -eidēs having the form of, derivative of eîdos form
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -oid

-oid

suffix, suffix
1.
indicating likeness, resemblance, or similarity: anthropoid
Word Origin
from Greek -oeidēs resembling, form of, from eidos form
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
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Word Origin and History for -oid

word-forming element meaning "like, like that of, thing like a ______," from Latinized form of Greek -oeides, from eidos "form," related to idein "to see," eidenai "to know;" literally "to see," from PIE *weid-es-, from root *weid- "to see, to know" (see vision). The -o- is connective or a stem vowel from the previous element.

Online Etymology Dictionary, © 2010 Douglas Harper
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-oid in Medicine

-oid suff.
Resembling; one that resembles: cancroid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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-oid in Science
-oid  
A suffix meaning "like" or "resembling," as in ellipsoid, a geometric solid that resembles an ellipse.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for -oid

-oid

suffix
  1. used to form adjectives Resembling or imitating what is indicated: blitzoid/ cheesoid/ technoid/ zomboid
  2. used to form nouns Something resembling or imitating what is indicated: flakoid/ fusionoid/ Grouchoid/ klutzoid •This
  3. is increasingly current, probably because of the popularity of fantasy and science fiction, esp among teenagers

[fr the scientific suffix -oid, fr Greek -oeides, ultimately fr eidos, ''image, form''; dictionaries list over 1,800 -oid compounds, most of which date from the 1700s and 1800s]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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-oid in Technology

jargon
(from "android") A suffix used as in mainstream English to indicate a poor imitation, a counterfeit, or some otherwise slightly bogus resemblance. Hackers will happily use it with all sorts of non-Greco/Latin stem words that wouldn't keep company with it in mainstream English. For example, "He's a nerdoid" means that he superficially resembles a nerd but can't make the grade; a "modemoid" might be a 300-baud modem (Real Modems run at 144000 or up); a "computeroid" might be any bitty box.
"-oid" can also mean "resembling an android", which was once confined to science-fiction fans and hackers. It too has recently (in 1991) started to go mainstream (most notably in the term "trendoid" for victims of terminal hipness). This is probably traceable to the popularisation of the term droid in "Star Wars" and its sequels.
Coinages in both forms have been common in science fiction for at least fifty years, and hackers (who are often SF fans) have probably been making "-oid" jargon for almost that long (though GLS and ESR can personally confirm only that they were already common in the mid-1970s).
[Jargon File]
(1999-07-10)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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