standard candle

Từ điển WordNet v3.1 - WordNet Dictionary

noun

the basic unit of luminous intensity adopted under the Systeme International d'Unites;
equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin
• Syn:
candle, candela, cd
• Derivationally related forms:
candle (for: candle)
• Hypernyms:
luminous intensity unit, candlepower unit