coolant

n [C, U] (type of) fluid used for cooling (eg in nuclear reactors) 冷却剂.

convoluted, convolution, convolvulus, convoy, convulse, convulsion, convulsive, convulsively, cony (also coney), coo, cook, cookbook, cooker, cookery, cookery book (also `cookbook), cookhouse, cookie (also cooky), cooking, cool, cool-headed, cooler, coolie, cooling, cooling tower, cooling-off, coolly, coolness, coon, coop, cooper, cooperate, cooperation, cooperative, coordinate, coordination, coordinator, coorperation, coot, cop, cop-out,