Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to a rhombohedron.
  • adjective Mineralogy Of or relating to a crystal having three axes of equal length intersecting at oblique angles.

from The Century Dictionary.

  • In geometry, of or pertaining to a rhombohedron; having forms derived from the rhombohedron.
  • In crystallography, relating to a system of forms of which the rhombohedron is taken as the type. They are embraced in the rhombohedral division of the hexagonal system. See hexagonal.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Geom. & Crystallog.) Related to the rhombohedron; presenting the form of a rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron.
  • adjective (Min.) See Hematite.
  • adjective (Crystallog.) a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective crystallography Having three equal axes and oblique angles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having threefold symmetry

Etymologies

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

[rhombohedr(on), –al.]

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