Definition of Goa stone in English:

Goa stone

noun

historical
  • A hard lump, typically spherical or egg-shaped, of an artificial material containing a variety of organic and inorganic components (including bezoar, coral, precious metals, aromatics, etc.), grated or shaved into a liquid for use as a (supposed) fever remedy.

Origin

Late 17th century; earliest use found in Robert Hooke (1635–1703), natural philosopher.