noun
Encyclopedia Nipponica
Proper noun referring to a specific Japanese encyclopedia published by Shogakukan.
日本大百科全書で調べてみよう。
Let's look it up in the Encyclopedia Nipponica.
Compound of 日本 (Nihon, Japan) + 大百科全書 (daihyakkazensho, large encyclopedia). The exact derivation is straightforward; it is the title of a specific reference work.