encyclopedia
US /ɪnˌsaɪ.kləˈpiː.di.ə/
UK /ɪnˌsaɪ.kləˈpiː.di.ə/
1.
百科事典
a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.
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I looked up the definition of 'atom' in the encyclopedia.
「原子」の定義を百科事典で調べた。
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The library has a vast collection of encyclopedias on various subjects.
図書館には様々な主題の百科事典が豊富に揃っている。