A very knowledgeable person is a walking encyclopedia.
walking encyclopedia|encyclopedia|walking
n. phr. A polymath; a person very well versed in a number of different disciplines. My uncle is a veritable walking encyclopedia when it comes to the history of World War II. Antonym: WALKING DICTIONARY.
An cyclopedia idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with cyclopedia, allowing users to choose the best word for their specific context.
Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb cyclopedia