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1. Chiastolite.
2. A twinned crystal.
3. A dark spot or discoloration in a mineral.

[French, from Old French, lozenge, from Latin macula, mesh.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) another name for chiastolite, twin3
[C19: via French from Latin macula spot, stain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmæk əl)

a twinned crystal.
[1720–30; < French]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Reconstruction of price and content shows that the price of 355 livres breaks down to 537 ordinary models (simples) at 10 sous, 11 twin models (macles) at 20 sous and 15 decrements at 100 sous, [1 livre or French pound = 20 sous.] Hence one skilled worker would need 150-170 full days, i.e.
Recordemos que Macles (87) al reflexionar sobre el objeto y la definicion de la bibliografia, valora en primer lugar su finalidad instrumental al apreciar que la labor del bibliografo es investigar, transcribir, anotar y clasificar los documentos, con el fin central de construir las obras denominadas repertorios bibliograficos o bibliografias.
Antwerp manufacturers now concentrate on the larger stones and the flat, usually triangular twinned diamonds called macles.