trigonal
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Related to trigonal: monoclinic, rhombohedral
tri·go·nal
(trī-gō′nəl)adj. Mineralogy
Rhombohedral.
[Earlier, relating to a trigon or triplicity, relating to three angles : Latin trigōnum, triangle; see trigon + -al.]
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.
trigonal
(ˈtrɪɡənəl)adj
1. (Mathematics) another word for triangular1
2. (Chemistry) Also: rhombohedral relating or belonging to the crystal system characterized by three equal axes that are equally inclined and not perpendicular to each other
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
trig•o•nal
(ˈtrɪg ə nl)adj.
1. of, pertaining to, or shaped like a triangle; having three angles; triangular.
2. (of a crystal) having threefold symmetry.
[1560–70]
trig′o•nal•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
tri·go·nal
(trī-gō′nəl) Relating to a crystal having three axes of equal length intersecting at oblique angles. This crystal system is considered a subset of the hexagonal system. The mineral quartz has trigonal crystals. Also called rhombohedral. See more at crystal.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj. | 1. | trigonal - having threefold symmetry crystallography - the branch of science that studies the formation and structure of crystals symmetric, symmetrical - having similarity in size, shape, and relative position of corresponding parts |
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