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mesocratic

[mez-uh-krat-ik, mes-, mee-zuh-, -suh-]
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adjective Petrology.
  1. (of an igneous rock) composed of light and dark minerals in nearly equal amounts.
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Origin of mesocratic

First recorded in 1855–60; meso- + -crat + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mesocratic

mesocratic

adjective
  1. (of igneous rocks) containing 30–60 per cent of ferromagnesian minerals
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Word Origin

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