from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to a crystalline structure of three mutually perpendicular axes of different length.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. having three unequal axes at right angles

from the GNU version of the Collaborative International Dictionary of English

  • adj. Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See crystallization.

from The Century Dictionary and Cyclopedia

  • Rectangular and rhombic.
  • In crystallography, noting the system of crystallography which is characterized by three unequal axes intersecting at right angles; belonging to this system: as, sulphur is orthorhombic. Also called trimetric. See crystallography.


ortho- +‎ rhombic (Wiktionary)


  • Today I learned that topaz is a mineral, the fluosilicate of aluminum, usually occurring in prismatic orthorhombic crystals of various colors.

    The Memory Palace

  • In fact, the RM 022's honeycomb orthorhombic titanium aluminide baseplate comes straight from NASA research into supersonic aircraft wings.

    The Edge of Time

  • Hmm all of these with the exception of Diamond can be found as a orthorhombic structure.

    Universe Puzzle No. 3 | Universe Today

  • Ice type XI is the orthorhombic form if any care to know.

    Universe Puzzle No. 3 | Universe Today

  • Rutile is made up mostly of titanium dioxide with two rarer polymorphs anatase or octahedrite, which is a tetragonal mineral of pseudo-octahedral habit, and brookite, which is an orthorhombic mineral, the Doctor explained to her.


  • As Wolfgang Beck, Thomas Klapötke and their team report in the journal ZAAC – Journal of Inorganic and General Chemistry, the orthorhombic crystals consist of separate, nearly linear Hg (CNO) 2 molecules.

    Explosive Crystal | Impact Lab

  • Mercury fulminate crystals are orthorhombic and the crystal consists, as expected, of separate Hg (CNO) 2 molecules.

    Explosive Crystal | Impact Lab

  • The stacking of the tetrahedral and octahedral sheets in the chrysotile structure has been shown to yield three types of chrysotile fibers: clino-chrysotile: monoclinic stacking of the layers, x parallel to fiber axis, most abundant formortho-chrysotile: orthorhombic stacking of the layers, x parallel to fiber axispara-chrysotile: two layer structure, 180° rotation of two-layer structures, y parallel to fiber axis

    Geology of asbestos

  • When the beings passed beneath Theriaults feet, she recognized the faceted shapes of their orthorhombic component structures.

    Reap the Whirlwind

  • That means we came painfully close to possibly discovering the biggest Indiana Jones And The Kingdom Of The Crystal Skull spoiler of them all – whether the crystal skull is made of tetragonal ionic crystal or orthorhombic covalent crystal.

    New Indiana Jones Trailer Means It’s Either Good, Bad, Or Neither


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  • "In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups."
    - Wikipedia

    August 25, 2007