A very knowledgeable person, as in Ask Robhe's a walking encyclopedia of military history. A similar expression, a walking dictionary, was used by George Chapman in his poem "Tears of Peace" (c. 1600).
|the offspring of a zebra and a donkey.|
|a gadget; dingus; thingumbob.|
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.