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WordReference Random House Learner's Dictionary of American English © 2016
a•dul•ter•ate /əˈdʌltəˌreɪt/USA pronunciation   v.,  -at•ed, -at•ing. [+ object]
  1. to make (a substance) impure by adding inferior or less desirable materials or elements: The whiskey was adulterated with inferior alcohol.
a•dul•ter•ated, adj. 
a•dul•ter•a•tion /əˌdʌltəˈreɪʃən/USA pronunciation  n. [uncountable]
a•dul•ter•a•tor, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2016
a•dul•ter•ate  (v. ə dultə rāt′;adj. ə dultər it, -tə rāt′),USA pronunciation v.,  -at•ed, -at•ing, adj. 
  1. to debase or make impure by adding inferior materials or elements;
    use cheaper, inferior, or less desirable goods in the production of (any professedly genuine article):to adulterate food.

  1. adulterated.
  2. adulterous (def. 1).
a•dulter•a′tor, n. 
  • Latin adulterātus mixed, adulterated (past participle of adulterāre), equivalent. to ad- ad- + -ulter (perh. combining form of alter other; see alter) + -ātus -ate1
  • 1580–90

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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