Definition of petrifactive in US English:

petrifactive

adjective

rare
  • Having the quality of petrifying; causing petrifaction.

Origin

Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From petrifact- + -ive, perhaps after e.g. calefactive, putrefactive, stupefactive; compare also chylifactive, satisfactive.

Pronunciation

petrifactive

/ˌpɛtrɪˈfaktɪv/