from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • suffix Of similar form to, but not the same as. Having the likeness of. Suffix appended to various words to make an adjective form.

from the GNU version of the Collaborative International Dictionary of English

  • suffix A suffix or combining form meaning like, resembling, in the form of.

from The Century Dictionary and Cyclopedia

  • n. A termination of many adjectives (and of nouns thence derived) of Greek origin, meaning ‘having the form or resemblance’ (often implying an incomplete or imperfect resemblance) of the thing indicated, ‘like,’ as in anthropoid, like man, crystalloid, like crystal, hydroid, like water, etc. It is much used as an English formative, chiefly in scientific words.


Greek -oeidēs, from eidos, shape, form; see weid- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek εἶδος (eidos, "form, likeness"). (Wiktionary)


  • The -oid suffix, rooted in the Greek for “shape,” creates a noun or adjective meaning “similar but not the same; having the characteristics of.”

    No Uncertain Terms


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