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Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

The largest and most trusted free online thesaurus. Quickly find accurate and up-to-date synonyms, antonyms, and related words at Thesaurus.com. Synonym dictionary, antonym dictionary, words synonyms.

Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it.

The mission of the National Institute on Drug Abuse (NIDA) is to lead the Nation bringing the power of science to bear on drug abuse and addiction.

The leading source for trustworthy and timely health and medical news and information. Providing credible health information, supportive community, and educational services by blending award-winning expertise in content, community services, expert co...

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world

The National Council on Alcoholism and Drug Dependence, Inc. (NCADD) provides education, information, help and hope to the public. It advocates prevention, intervention and treatment through offices in New York and Washington, and a nationwide ne...