It is not slang..It means a large volume of literature, usually scholarly material.

No it is not a slang term, in fact 'tome' is an old fashioned word and rarely used nowadays. ACohen's answer is correct. The word 'tome' is a noun and is derived from the Latin word tomus, from Greek tomos, meaning a cutting or a section.

There are 2 meanings for tome - a scholarly book or a book that is part of a larger collection, for example, a volume of an encyclopedia.

Hello Uaitar, Tome means in general a book ,a written composition that has been published ,a scholarly book and in particular it could mean: - trade book 'trade edition' - pop-up books ,which is a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened. - booklet, brochure , folder - appointment book or calendar - catalog - phrase book -- (a book containing common expressions in a foreign language along with their translations), that is when you are learning a foreign language you keep a tome. - playbook containing the script of dramatic plays. - song book containing a collection of songs - story book containing a collection of stories usually for children. - reference book ,a book of facts containing authoritative facts. Those are some among other ways of using the word 'tome'.