adjective Crystallography.

noting or pertaining to a system of crystallization in which the crystals have three unequal axes, with one oblique intersection.

Origin of monoclinic

1865–70; mono- + Greek klī́n(ein) to incline + -ic Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for monoclinic

Historical Examples of monoclinic

  • The crystals are monoclinic and occur in porphyry almost exclusively.

    Rimrock Trail

    J. Allan Dunn

  • Monoclinic crystals common, usually of simple forms, as shown by Figure 75i.


    William J. Miller

  • Pyroxenes crystallizing in the monoclinic system are the most important.


    William J. Miller

  • Sulphur exists in two well-known crystalline forms—rhombic, or octahedral, and monoclinic, or prismatic sulphur.

  • In the case of sulphur, the transition point of rhombic into monoclinic sulphur was found by Reicher to lie at 95.5.

British Dictionary definitions for monoclinic



crystallog relating to or belonging to the crystal system characterized by three unequal axes, one pair of which are not at right angles to each other

Word Origin for monoclinic

C19: from mono- + Greek klīnein to lean + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for monoclinic



Relating to a crystal having three axes of different lengths. Two of the axes are at oblique angles to each other, and the third axis is perpendicular to the plane that is made by the other two. The mineral gypsum has monoclinic crystals. See illustration at crystal.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.