开本

開本
kāiběn
book format, similar to in-4°, in-8° etc (a 16-kai format 16開|16开 shíliùkāi is roughly A4) (abbr. to 开 kāi)

CEDICT

Entry Composition

1 开 kāi
  1. to open (transitive or intransitive)
  2. (of ships, vehicles, troops etc) to start
  3. to turn on; to put in operation; to operate; to run
  4. to boil
  5. to write out (a prescription, check, invoice etc)
  6. (directional complement) away; off
  7. carat (gold)
  8. abbr. for Kelvin, 开尔文 Kāiěrwén
  9. abbr. for 开本 kāiběn, book format
2 本 běn
  1. (bound form) root; stem
  2. (bound form) origin; source
  3. (bound form) one's own; this
  4. (bound form) this; the current (year etc)
  5. (bound form) original
  6. (bound form) inherent
  7. originally; initially
  8. capital; principal
  9. classifier for books, periodicals, files etc