Acronym Finder from Mountain Data Systems
Find definitions of more than 214,000 abbreviations and acronyms.
Dictionary.com from Lexico Publishing Group, LLC
Offers a multi-source dictionary search that includes The American Heritage Dictionary and Webster's Revised Unabridged Dictionary.
MedlinePlus Dictionary of Medical Terms from Merriam-Webster, the National Library of Medicine, and the National Institutes of Health
Online medical dictionary from MedlinePlus.
Merriam-Webster Online from Merriam-Webster
Search Merriam-Webster's online dictionary and/or thesaurus.
OneLook Dictionaries from OneLook
Search more than 675 general and subject dictionaries from this site.
Rhyme Zone from DataMuse
Find rhyming words, homophones, synonyms, and more.
WordReference from Mike Kellogg and WordReference.com
Online French, Italian, and Spanish Dictionary. Also includes English definitions.