WordReference Random House Learner's Dictionary of American English © 2015
a•dul•ter•ate /əˈdʌltəˌreɪt/USA pronunciation v., -at•ed, -at•ing.[+ object]

    to make (a substance) impure by adding inferior or less desirable materials or elements: The whiskey was adulterated with inferior alcohol.
a•dul•ter•a•tion/əˌdʌltəˈreɪʃən/USA pronunciationn. [uncountable]
a•dul•ter•a•tor,n. [countable]

Collins Concise English Dictionary © HarperCollins Publishers::

adulterate vb /əˈdʌltəˌreɪt/
  1. (transitive) to debase by adding inferior material: to adulterate milk with water
adj /əˈdʌltərɪt; -ˌreɪt/
  1. adulterated; debased or impure
Etymology: 16th Century: from Latin adulterāre to corrupt, commit adultery, probably from alter another, hence to approach another, commit adultery

aˌdulterˈation n aˈdulterˌator n

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