calculi

'calculi'

[calculus.n.01] as in: a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

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Examples:
renal calculi can be very painful

'calculi'

[tartar.n.04] as in: an incrustation that forms on the teeth and gums

'calculi'

[calculus.n.03] as in: the branch of mathematics that is concerned with limits and with the differentiation and integration of functions