rumiroli 

A slang word for a yoyo, often used to replace the word yoyo.

"Hey, check out my rumiroli!"

rumiroli by Therumiroliguy December 22, 2017

Ruminolith

describing more sepcifically than "gastrolith" (stomach stone) to a mineralized conglomerate within the rumen (1. stomach) of a ruminant like a cow.

During necropsy, the rumen of the cow contains multiple, up to 10 cm in diameter large ruminoliths.

Ruminolith by IntraVenoes June 5, 2020