Tome/təʊm/ Definition 1 of 2Pro Tip 1/3Physical Heft Refers to books physically large or heavy, often hardcover. The professor's desk was stacked with intimidating tomes. Pro Tip 2/3Intellectual Depth Signifies in-depth discussion or comprehensive coverage on a subject. Her thesis was a tome filled with detailed analyses. Pro Tip 3/3Implies Importance Often suggests the book has scholarly or historical significance. The tome contained centuries of wisdom on herbal medicine.