| 单词 | phenocryst |
| 释义 | phenocryst[ fee-nuh-krist, fen-uh- ] / ˈfi nə krɪst, ˈfɛn ə- / noun Petrology.any of the conspicuous crystals in a porphyritic rock. Origin of phenocrystFirst recorded in 1890–95; pheno- + cryst(al) Words nearby phenocrystphenmetrazine, pheno-, phenobarbital, phenobarbitone, phenocopy, phenocryst, phenodeviant, phenogram, phenol, phenolate, phenolated Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for phenocrystphenocryst / (ˈfiːnəˌkrɪst, ˈfɛn-) / nounany of several large crystals that are embedded in a mass of smaller crystals in igneous rocks such as porphyry Word Origin for phenocrystC19: from pheno- (shining) + crystal 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 Scientific definitions for phenocrystphenocryst [ fē′nə-krĭst′ ] A large crystal that is surrounded by a finer-grained matrix in an igneous rock. Phenocrysts are usually the first crystals to form from a cooling magma, and therefore have sufficient room to grow to a large size. They are analogous to porphyroblasts in metamorphic rock. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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