Opposable
Pronunciation : Op*pos"a*ble
Part of Speech : a.
Definition : 1. Capable of being opposed or resisted.
2. Capable of being placed opposite something else; as, the thumb is opposable to the forefinger.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder