[ey-suh-me-trik, as-uh-]
not identical on both sides of a central line; unsymmetrical; lacking symmetry: Most faces are asymmetric.
(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.”
having an unsymmetrical arrangement of atoms in a molecule.
noting a carbon atom bonded to four different atoms or groups.
(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.
Also, asymmetrical.

1870–75; a-6 + symmetric

asymmetrically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asymmetric or asymmetrical (ˌæsɪˈmɛtrɪk, ˌeɪ-)
1.  not symmetrical; lacking symmetry; misproportioned
2.  chem
 a.  (of a molecule) having its atoms and radicals arranged unsymmetrically
 b.  (of a carbon atom) attached to four different atoms or radicals so that stereoisomerism results
 c.  involving chiral molecules: asymmetric 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 symmetric antisymmetric Compare nonsymmetric (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…"
asymmetrical or asymmetrical
asym'metrically or asymmetrical

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1680s, from asymmetry + -ical. Other forms that have served as an adj. based on asymmetry are asymmetral (1620s), asymmetrous (1660s), and asymmetric (1875); only the last seems to have any currency.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

asymmetrical a·sym·met·ri·cal (ā'sĭ-mět'rĭ-kəl) or a·sym·met·ric (-rĭk)
Abbr. a
Lacking symmetry between two or more like parts; not symmetrical.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There are two basic kinds of catamarans on the market: symmetrical and
The job market is full of exploitation and asymmetrical power relationships.
But in asymmetrical warfare, the test of victory is asymmetrical too.
Apparently the asymmetrical standard is that anything else other the lies
  offered is evidence of censorship.
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