cat-o-nine-tails

n [sing] whip with nine knotted lashes, formerly used for flogging prisoners 九尾鞭（由九条带纥结的鞭条做的鞭子, 旧时用以抽打囚犯）.

castor oil, castor sugar (also caster sugar), castrate, castration, casual, casually, casualness, casuals, casualty, casualy, casuist, casuistic, casuistically, casuistry, casus belli, cat, cat burglar, cat out of the bag, cat's-cradle, Cat's-eye, cataclysm, cataclysmic, catacombs, catafalque, catalepsy, cataleptic, catalog, catalogue, catalogue (US also catalog), catalysis, catalyst, catalytic, catalyze, catamaran, catapult, cataract, catarrh, catastrophe, catastrophic, catastrophically,