-oid


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-oid

suff.
1. Resembling; having the appearance of; related to: acanthoid.
2. One that resembles something specified or has a specified quality: humanoid.

[Greek -oeidēs, from eidos, shape, form; see weid- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-oid

suffix forming adjectives, suffix forming nouns
indicating likeness, resemblance, or similarity: anthropoid.
[from Greek -oeidēs resembling, form of, from eidos form]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-oid

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; humanoid; planetoid. Compare -ode 1 .
[< Greek -oeidēs=-o- -o- + -eidēs having the form of, derivative of eîdos form (see eidetic)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

-oid

A suffix meaning "like" or "resembling," as in ellipsoid, a geometric solid that resembles an ellipse.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.