(chiefly humorous)a book, especially a large, heavy, scholarly one (主幽默)书;大部头书;(有学术价值的)巨著 a weighty tome. 一本沉甸甸的大部头书。
语源
early 16th cent. (denoting one volume of a larger work): from French, via Latin from Greek tomos 'section, roll of papyrus, volume'; related to temnein 'to cut'