[vahy-jes-uh-moh] 
noun, plural -mos, adjective | Bookbinding. twentymo. |
[twen-tee-moh, twuhn-] noun, plural -mos, adjective | 1. | a book size of about 3 × 5 in. (8 × 12 cm), determined by printing on sheets folded to form 20 leaves or 40 pages. |
| 2. | a book of this size. Symbol: 20mo, 20° |
| 3. | in twentymo. |