ovoid

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ovoid

Botany (of a fruit or similar part) egg-shaped with the broader end at the base

Ovoid

 

(1) A large spherical phenocryst in magmatic rock resulting from the partial resorption of a previously formed phenocryst. Ovoids are a characteristic feature of the rapakivi granite in the vicinity of Vyborg.

(2) A spherical limestone grain having a radial structure. Certain varieties of ovoids are oolites. Ovoids form oolitic and ovoid limestones.