noun Geology.

any coarse rock, as breccia or conglomerate.

Origin of psephite

< Greek psêph(os) pebble + -ite1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for psephite



any rock, such as a breccia, that consists of large fragments embedded in a finer matrix
Derived Formspsephitic (siːˈfɪtɪk), adjective

Word Origin for psephite

C19: via French from Greek psēphos a pebble
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012