chalkstone

plural chalkstones

1. obsoleteA mass or piece of chalk.

   [W]hen he maketh all the stones of the altar as chalkstones that are beaten in sunder, the groves and images shall not stand up.

   1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Isaiah 27:9

2. medicineA chalk-like concretion, consisting mainly of urate of sodium, found in those affected with gout; a tophus.

   [T]he thoughts of his breeding Gout so fast shocks me: it has beside all the rest made a Deposit in the Great Toe—I mean in the Joint, as if intending a Chalkstone.

   1794 January 23, Hester Lynch Piozzi, Thraliana