gastrolith

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gastrolith

[′ga·strə‚lith]
(vertebrate zoology)
A pebble swallowed by certain animals and retained in the gizzard or stomach, where it serves to grind food.
References in periodicals archive ?
Some dinosaurs also possessed gastroliths, perhaps for a similar reason.
n A sauropod's stomach could hold up to half a tonne and had large stones inside it - gastroliths - to help grind down and digest the food.
One specimen (GCSU 4462) contained two crayfish gastroliths and a few isolated legs in its gut.
New analyses of the gastroliths in ostriches are casting doubt on that theory.
Those clues include gastroliths, or stomach stones, that would have ground ingested vegetation to a pulp.