adjective Crystallography.
noting or pertaining to a system of crystallization characterized by three unequal axes intersecting at right angles; rhombic; trimetric.
Compare crystal system.

1865–70; ortho- + rhombic

pseudoorthorhombic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
orthorhombic (ˌɔːθəʊˈrɒmbɪk)
crystallog rhombic, Also: trimetric relating to the crystal system characterized by three mutually perpendicular unequal axes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
orthorhombic   (ôr'thō-rŏm'bĭk)  Pronunciation Key 
Relating to a crystal having three axes of different lengths intersecting at right angles. The mineral topaz has orthorhombic crystals. See illustration at crystal.
The American Heritage® Science Dictionary
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