Definition of ooid in US English:

ooid

(also oöid)

noun

Geology
  • Oolith.

Origin

Early 20th century; earliest use found in Journal of Geology. From German Ooid from ancient Greek ᾠοειδής egg-shaped from ᾠο- + -οειδής.

Pronunciation

ooid

/ˈəʊɔɪd/