ooid

O1O1I1D2
UK/ˈəʊˌɔɪd/US/ˈoʊˌɔɪd/

noun

A small calcium carbonate- or iron-coated grain found on the seafloor.

Similar
oolith
OriginAncient Greek ᾠοειδής →
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Meanings

nounooid (plural ooids)

plural ooids

  1. geographyA small calcium carbonate- or iron-coated grain found on the seafloor.

    Synonyms: oolith

adjectiveooid (comparative more ooid, superlative most ooid)

comparative more ooid · superlative most ooid

  1. Shaped like an egg; ovoid; ovate.

    One thinks of everything from amphitheaters like the Colosseum to Buckminster Fuller in his more ooid modes

    2001, George L. Hersey, The Monumental Impulse: Architecture's Biological Roots, page 152

Synonyms & antonyms

nounA small calcium carbonate- or iron-coated grain found on the seafloor.

Similar
oolith
Also see
ooidaloolite

Origin

  1. Ancient Greekᾠοειδής
  2. Ancient Greekᾠοειδής
  3. Englishooid

Learned borrowing from Ancient Greek ᾠοειδής (ōioeidḗs). By surface analysis, oo- (“egg”) + -(o)id (“-like, appearing”).

More words from Ancient Greek

Full word history & related roots →

Translations

Finnish ooliitti, munanmuotoinen
  • ooliittiseafloor grain
  • munanmuotoinenegg-shaped
Cite this entry
APA

ooid. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ooid

MLA

“ooid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ooid. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ooid,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ooid.

Source: ooid on Wiktionary, CC BY-SA 4.0.