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

気胸[kikyou] pneumothorax
胸囲[kyoui] chest measurement
胸奥[kyouou] one's heart of hearts
胸郭[kyoukaku] chest
胸襟[kyoukin] one's heart

胸もと[munamoto] breast
胸腔[kyoukou] thorax
胸骨[kyoukotsu] breastbone
胸三寸[munesanzun] heart