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

渦巻[uzumaki] whirlpool
渦巻く[uzumaku] to whirl
渦状[kajou] spiral
渦中[kachuu] vortex
渦潮[uzushio] whirling tides

渦動[kadou] vortex
渦紋[kamon] whirlpool design
渦流[karyuu] swirling current
渦巻き形[uzumakigata] spiral-shaped