• Activa General Spanish/English Dictionary
  Dictionary has about 25,000 entries with brief definitions.
• All Words
  Type in a word in one of six languages and find out its translation in any of the others.
• Diccionario Inglés/Español
  Type in a word and find the Spanish equivalent.
• Diccionario Español/Inglés
  Type in a word and find the English equivalent.
• Diccionario de Antónimos
  Type in a word and receive a list of up to 30 that have opposite meaning.
• Diccionario de Sinónimos
  Type in a word and receive a list of up to 30 that have similar meanings.
• Diccionarios
  Thorough definitions for translating between Spanish and English. With nearly 100,000 entries, this is one of the most complete dictionaries available.
• English/Spanish - Spanish/English Dictionary
  Get translations not only of the word you type in, but of related words as well.
• SpanishDict.com
  Type in a word and get the translation in Spanish or English. A nice feature is that sound clips provide the pronunciation for many words.
• WordReference.com
  One of the best dictionaries for finding idioms and phrases. Type in "town," for example, to find out how to say "to go out on the town" in Spanish.
• Diccionario de Regionalismos de la Lengua Española
  Words from throughout the Spanish-speaking word are listed and defined along with the country of use. In Spanish only.
• Jergas de Habla Hispana
  Lists, by country, of slang, argot, and jargon. In Spanish only.
• Diccionario de Español
  Type in a word in Spanish and receive its meaning in Spanish.
• Diccionario de la Bolsa de Valores
  Financial terms explained. In Spanish only.
• Glosario meterológico
  Excellent source for weather terms, from the Spanish version of The Weather Channel
• Diccionary of Medical Terms
  List and Glossary of medical terms in Spanish
• Ciber-Léxico Comparativo
  Large collection of computer-related terms translated from English to Spanish.