Definition of psephite in English:

psephite

noun

Geology
  • A coarse-grained breccia, conglomerate, or similar sedimentary rock; (in later use) specifically such a rock after metamorphic alteration.

Origin

Early 19th century; earliest use found in Henry Thomas De la Beche (1796–1855), geologist. From ancient Greek ψῆϕος pebble, round stone + -ite, after French psêfite.

Pronunciation

psephite

/ˈ(p)sɛfʌɪt/