From Longman Dictionary of Contemporary Englishadulteratea‧dul‧ter‧ate /əˈdʌltəreɪt/ verb [transitive] PUREto make food or drink less pure by adding another substance of lower quality to it → unadulterated —adulteration /əˌdʌltəˈreɪʃən/ noun [uncountable]→ See Verb table
Examples from the Corpus
adulterate• Try not to adulterate such healthy basics with too rich a dressing.Origin adulterate (1500-1600) Latin past participle of adulterare, from ad- “to” + alter “other” 