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Of or relating to a crystalline structure of three mutually perpendicular axes of different length.
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.
(Chemistry) crystallog relating to the crystal system characterized by three mutually perpendicular unequal axes. Also: rhombic or trimetric
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
or•tho•rhom•bic(ˌɔr θəˈrɒm bɪk)
noting or pertaining to a system of crystallization characterized by three unequal axes intersecting at right angles; rhombic.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Relating to a crystal having three axes of different lengths intersecting at right angles. The mineral topaz has orthorhombic crystals. 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.