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-oid

  1. resembling : having the form or appearance of
L1225561 on Wikidata ↗

suffix

  1. something resembling a (specified) object or having a (specified) qualit
L348014 on Wikidata ↗

Wiktionary

Pronunciation: /-ɔɪd/ / /-oɪd/

suffix

Etymology: Learned borrowing from Latin -oīdēs, from Ancient Greek -ο-ειδής (-o-eidḗs) (the ο being the last vowel of the stem to which the suffix is attached); from εἶδος (eîdos, “form, likeness”).

  1. Resembling; having the likeness of (usually including the concept of not being the same despite the likeness, but counterexamples exist).

    human + -oid → humanoid

    sterol + -oid → steroid

  2. Of, pertaining to, or related to.

    lympho- + -oid → lymphoid

    myelo- + -oid → myeloid

  3. Added to nouns to create derogatory terms, typically referring to a particular ideology or group of people.

    waste + -oid → wastoid

    west + -oid → westoid

  4. Added typically to the name of an algebraic structure, to denote the horizontal categorification of that structure.

    group + -oid → groupoid

    ring + -oid → ringoid