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asymmetric

or a·sym·met·ri·cal

[ey-suh-me-trik or ey-suh-me-tri-kuh l; as-uh-]
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adjective
  1. not identical on both sides of a central line; unsymmetrical; lacking symmetry: Most faces are asymmetric.
  2. (of a logical or mathematical relation) holding true of members of a class in one order but not in the opposite order, as in the relation “being an ancestor of.”
  3. Chemistry.
    1. having an unsymmetrical arrangement of atoms in a molecule.
    2. noting a carbon atom bonded to four different atoms or groups.
    3. (of a polymer) noting an atom or group that is within a polymer chain and is bonded to two different atoms or groups that are external to the chain.
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Origin of asymmetric

First recorded in 1870–75; a-6 + symmetric
Related formsa·sym·met·ri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

awrycrookedunbalancedunequaldisproportionalgibbousunsymmetrical

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British Dictionary definitions for asymmetrical

asymmetric

asymmetrical

adjective
  1. not symmetrical; lacking symmetry; misproportioned
  2. chem
    1. (of a molecule) having its atoms and radicals arranged unsymmetrically
    2. (of a carbon atom) attached to four different atoms or radicals so that stereoisomerism results
    3. involving chiral moleculesasymmetric synthesis
  3. electrical engineering (of conductors) having different conductivities depending on the direction of current flow, as of diodes
  4. aeronautics having unequal thrust, as caused by an inoperative engine in a twin-engined aircraft
  5. logic maths (of a relation) never holding between a pair of values x and y when it holds between y and x, as " …is the father of… "Compare symmetric (def. 1), antisymmetric, nonsymmetric
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Derived Formsasymmetrically, adverb
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

Word Origin and History for asymmetrical

adj.

1680s; see asymmetry + -ical. Other forms that have served as an adjective based on asymmetry are asymmetral (1620s), asymmetrous (1660s), and asymmetric (1875); only the last seems to have any currency. Related: Asymmetrically.

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Online Etymology Dictionary, © 2010 Douglas Harper

asymmetrical in Medicine

asymmetrical

(ā′sĭ-mĕtrĭ-kəl)
adj.
  1. Lacking symmetry between two or more like parts; not symmetrical.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.