American Heritage® Dictionary of the English Language, Fourth Edition
- n. Resembling; having the appearance of; related to: acanthoid.
- n. One that resembles something specified or has a specified quality: humanoid.
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.
- n. Of similar form to, but not the same as. Having the likeness of. Suffix appended to various words to make an adjective form.
GNU Webster's 1913
- n. A suffix or combining form meaning like, resembling, in the form of.
- From Ancient Greek εἶδος (eidos, "form, likeness"). (Wiktionary)
- Greek -oeidēs, from eidos, shape, form; see weid- in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The -oid suffix, rooted in the Greek for “shape,” creates a noun or adjective meaning “similar but not the same; having the characteristics of.””
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