either of two units of heat energy 卡,卡路里(两个热量单位之一) ■(亦作 small calorie)(缩略词: cal)the energy needed to raise the temperature of 1 gram of water through 1 °C (now usually defined as 4.1868 joules) 小卡(现一般定为4.1868焦耳) ■(亦作 large calorie)(缩略词: Cal)the energy needed to raise the temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories and often used to measure the energy value of foods 大卡,千卡
语源
mid 19th cent.: from French, from Latin calor 'heat' + French suffix -ie (see -y)