adulterate

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a·dul·ter·ate / əˈdəltəˌrāt/ • v. [tr.] render (something) poorer in quality by adding another substance, typically an inferior one: the meat was ground fine and adulterated with potato flour. DERIVATIVES: a·dul·ter·a·tion / əˌdəltəˈrāshən/ n.a·dul·ter·a·tor / -ˌrātər/ n.

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