Definition of peperite in US English:

peperite

noun

Geology
rare
  • A brecciated volcanic material in marine sedimentary rock, regarded by some as being formed by the intrusion of lava or magma into sediment under water, and by others as a product of the mixing of volcanic ejecta with such sediments.

Origin

Mid 19th century; earliest use found in The Civil Engineer and Architect's Journal. From peper- + -ite, after French pépérite.

Pronunciation

peperite

/ˈpɛpərʌɪt/