octavo

n (pl ~s) (abbrs 缩写 oct) (size of a) book or page produced by folding a piece of paper of standard size three times to give eight sheets 八开; 八开的纸; 八开本的书.

occupy, occur, occur to, occurrence, ocean, ocean lane, ocean-going, oceanarium, Oceania, oceanic, oceanography, ocelot, ochre (US also ocher), Oct, oct(o)-, octagon, octagonal, octane, octane number (also `octane rating), octave, octet (also octette), October, octogenarian, octopus, ocular, oculist, odd, odd job man, odd jobs, odd-looking, oddball, oddity, oddly, oddment, oddness, odds, odds-on, ode, odious, odiousness,