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  • noun

Synonyms for calculus

an incrustation that forms on the teeth and gums

the branch of mathematics that is concerned with limits and with the differentiation and integration of functions

References in periodicals archive ?
The molt stages of each crayfish were determined in terms of gastrolith growth according to the molt mineralization index (MMI).
Calcium transport in crayfish gastrolith disc: morphology of gastrolith disc and ultrahistochemical demonstration of calcium.
In some crayfish, gastroliths are reported to be composed of calcium carbonate in an extremely poorly crystalline state, as they do not diffract X-rays or electrons (10).
Gillette, Utah's state paleontologist, identifies the rocks as gastroliths -- so called "stomach stones" that certain animals hold within their digestive tract to grind food.
Some dinosaurs also possessed gastroliths, perhaps for a similar reason.
The only non-molluscan fauna include two small crayfish gastroliths. All Loess deposits are considered strictly eolian in origin.
Stomachs with calcified gastroliths were subsequently disregarded, thereby effectively eliminating from the present study all premolt lobsters from stage [D.sup.1.5] (=[D.sub.0]) on (Aiken, 1980).
One section I found most fascinating was Chapter Six on gastroliths ("stomach stones").
You can locate the homes of big, crayfish-eating trout by keeping an open eye for gastroliths. Crayfish require a large amount of calcium to build their shells.
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.
This student told me, "This doesn't really have anything to do with geology, but it sure is neat!" I argued that it had strong relevance to geology and paleontology because we can use those gastroliths as clues about diet and migratory patterns.
For example, the body mass of crocodiles and alligators that is rock gastroliths is 0.5-1.0%.
New analyses of the gastroliths in ostriches are casting doubt on that theory.