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

ちくちく痛む[chikuchikuitamu] to prickle
哀痛[aitsuu] sorrowing with the bereaved
圧痛点[attsuuten] pressure point
胃痛[itsuu] stomach-ache
筋肉痛[kinnikutsuu] muscular pain

苦痛[kutsuu] pain
腰痛[youtsuu] lower back (or hip) pain
手痛い[teitai] severe
陣痛[jintsuu] labour (birth) pains
精神的苦痛[seishintekikutsuu] mental anguish

鯔背[inase] gallant
違背[ihai] violation
棄背[kihai] giving up and turning back
向背[kouhai] one's attitude
上背[uwazei] stature

側背[sokuhai] flank
団栗の背比べ[dongurinoseikurabe] having no outstanding characteristics
中肉中背[chuunikuchuuzei] medium build
中背[chuuzei] average height
二律背反[niritsuhaihan] antinomy