Pronunciation: (tōm), [key]
1. a book, esp. a very heavy, large, or learned book.
2. a volume forming a part of a larger work.
a combining form with the meanings “cutting instrument” (microtome; osteotome), “segment, somite” (sclerotome), used in the formation of compound words. Cf. tomo-, -tomous, -tomy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.