candela
/kænˈdiːlə/(缩略词： cd)
noun
- Physics the SI unit of luminous intensity. One candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian.【物理】坎德拉, 新烛光（发光强度单位）。
词源
1950s: from Latin， 'candle'.