-oid

from The Collaborative International Dictionary of English v.0.48

-oid \-oid\ (-oid) suff. [Gr. ?, fr. e'i^dos form, akin to ? to
   see, and E. wit: cf. F. -o["i]de, L. -o["i]des.]
   A suffix or combining form meaning like, resembling, in the
   form of; as in anthropoid, asteroid, spheroid.
   [1913 Webster]

from Jargon File (4.4.4, 14 Aug 2003)

-oid
 suff.

   [from Greek suffix -oid = in the image of]

   1. Used as in mainstream slang 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 box (Real Modems
   run at 28.8 or up); a computeroid might be any {bitty box}. The word
   keyboid could be used to describe a {chiclet keyboard}, but would have
   to be written; spoken, it would confuse the listener as to the
   speaker's city of origin.

   2. More specifically, an indicator for `resembling an android' which
   in the past has been 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 popularization of the term {droid} in Star Wars and
   its sequels. (See also {windoid}.)

   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 I can
   personally confirm only that they were already common in the mid-1970s
   --ESR].

from The Free On-line Dictionary of Computing (8 July 2008)

-oid

   <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)