/ˌbi: es ˈi: ||; ˌbi ɛs ˈi/(informal 非正式mad ˈcow disease) noun [U] bovine spongiform encephalopathy; a disease of cows which affects their brains and usually kills them 牛脑海绵状病；疯牛病 ☞Look at CJD. 参看 CJD。