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The leading Proto-Indo-European dictionary with detailed definitions, and advanced learning features. DICTIONARY • Detailed definitions • Word Origins • Cross reference • Synonym, antonym • Derived terms • Related terms • Usage notes • Sentences • Descendants • Alternative forms ROOTS • Over 700 roots • Detailed definitions PARTS OF SPEECH • Proto-Indo-European adjectives • Proto-Indo-European adverbs • Proto-Indo-European nouns • Proto-Indo-European numeral • Proto-Indo-European pronouns • Proto-Indo-European verbs UNITS • 65 units • Learn words, roots in a unit with flashcards OTHER FEATURES • Search feature: search by word or by meaning; voice search • Bookmark words • Built-in dictionary • Share an entry • Words of the day: learn 20 Proto-Indo-European words daily