opposable

[uh-poh-zuh-buhl]
adjective
1.
capable of being placed opposite to something else: the opposable thumb of primates.
2.
capable of being resisted, fought, or opposed.

Origin:
1660–70; oppose + -able

opposability, noun
nonopposable, adjective
unopposable, adjective
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World English Dictionary
opposable (əˈpəʊzəbəl)
 
adj
1.  capable of being opposed
2.  Also: apposable (of the thumb of primates, esp man) capable of being moved into a position facing the other digits so as to be able to touch the ends of each
3.  capable of being placed opposite something else
 
op'posably
 
adv
 
opposa'bility
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

opposable
1833, in reference to thumbs, from oppose + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Without opposable thumbs, none of this would have ever been possible.
Maisie's lack of opposable thumbs apparently does not preclude her ability to
  create a moniker all on her own.
Besides being helpful in themselves, opposable thumbs are valuable in that they
  allow us to use other, more complicated tools.
Elsewhere, adroitness of thumb has even manifested itself in contests of
  opposable dexterity.
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