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

小鰭[kohada] mid-sized konoshiro gizzard shad (i.e. about 15 cm in size)
鰭脚類[kikyakurui] pinnipeds (seals and walruses)
尾鰭[ohire] tail and fins
尾鰭[obire] caudal fin
背鰭[sebire] dorsal fin

鱶鰭[fukahire] shark fin
臀鰭[shiribire] anal fin (of a fish)
尾鰭を付ける[ohirewotsukeru] to exaggerate
小鰭巨頭[kobiregondou] short-finned pilot whale (Globicephala macrorhyncus)