mesocratic

[ mez-uh-krat-ik, mes-, mee-zuh-, -suh- ]
/ ˌmɛz əˈkræt ɪk, ˌmɛs-, ˌmi zə-, -sə- /

adjective Petrology.

(of an igneous rock) composed of light and dark minerals in nearly equal amounts.

Origin of mesocratic

First recorded in 1855–60; meso- + -crat + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for mesocratic

mesocratic
/ (ˌmɛsəˈkrætɪk) /

adjective

(of igneous rocks) containing 30–60 per cent of ferromagnesian minerals

Word Origin for mesocratic

C20: from meso- + -crat, with allusion to the moderately dark colour of the rock. Compare leucocratic
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