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

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.

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

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...

Vocabulary.com helps you learn new words, play games that improve your vocabulary, and explore language.

The Free Online English Dictionary from Macmillan Publishers.

YouTube is a place to discover, watch, upload and share videos.

Longman English Dictionary is the leading dictionary for learners of English of all ages and levels who want to learn more about English: definition, idioms, examples and more.

Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment.

An archived home page that highlights lava pouring into the sea from Kilauea Volcano, Hawaii.

Department of Geological Sciences at San Diego State University (CSU). An Overview of the Undergraduate and Graduate programs, Faculty, Staff, Research, and Outreach.