Definition of pyrognostic in US English:

pyrognostic

adjective

Mineralogy
rare
  • Designating the characteristics of a mineral that are exhibited when it is heated under experimental conditions; of or relating to the investigation of such characteristics.

Origin

Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From pyro- + gnostic, after diagnostic, geognostic, etc.

Pronunciation

pyrognostic

/ˌpʌɪrə(ʊ)ɡˈnɒstɪk/