御中[onaka] stomach
御話中[ohanashichuu] busy (phone)
アル中[aruchuu] alcoholism
π中間子[paichuukanshi] pi meson
暗中[anchuu] in the dark

暗中摸索[anchuumosaku] groping in the dark
意中[ichuu] one's mind
意中の女[ichuunoonna] sweetheart
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一日中[ichinichijuu] all day long

詩篇[shihen] book containing a collection of poems
千篇[senpen] many volumes
続篇[zokuhen] continuation
単語篇[tangohen] glossary
短篇小説[tanpenshousetsu] short story

長篇[chouhen] long (e.g. novel, film)
佳篇[kahen] outstanding poem
千篇一律[senpenichiritsu] humdrum
前篇[zenpen] first part