En ‧ cy ‧ clo ‧ pae ‧ di ‧ a Bri ‧ tan ‧ ni ‧ ca, the /ɪnˌsaɪkləˌpiːdiə brɪˈtænɪkə/ BrE AmE trademark
an ↑ encyclopedia (=a book containing articles about many different subjects) , which consists of many ↑ volume s (=separate books that are part of a set) and is now also available ↑ online and as a DVD. It has been produced for over 200 years, and at one time salesmen used to go to people’s houses to persuade them to buy the books.