gastrolith

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gas·tro·lith

 (găs′trə-lĭth′)
n.
1. A pathological stony mass formed in the stomach; gastric calculus.
2. A small stone found in the stomach of some reptiles, fish, and birds that aids in digestion by helping grind ingested food material.

gastrolith

(ˈɡæstrəlɪθ)
n
(Pathology) pathol a stone in the stomach; gastric calculus

gas•tro•lith

(ˈgæs trə lɪθ)

n.
a calculous concretion in the stomach.
Translations

gas·tro·lith

n. gastrolito, concreción en el estómago.
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References in periodicals archive ?
The discovery of the gastroliths associated with this plesiosaur specimen were particularly exciting because most plesiosaur gastroliths are found associated with the long-neck morphotype," Schmeisser explained, adding that "the stones described in our paper are much lighter and smaller than those found in long-neck plesiosaurs.
The digestive tracts of both plesiosaurs also contained dozens of gastroliths, stones that paleontologists speculate were used to grind up hard-shelled prey and thereby aid digestion.
The only non-molluscan fauna include two small crayfish gastroliths.
Stomachs with calcified gastroliths were subsequently disregarded, thereby effectively eliminating from the present study all premolt lobsters from stage [D.
One section I found most fascinating was Chapter Six on gastroliths ("stomach stones").