单词	octane number
释义	octane number noun : a number that is used to measure the antiknock properties of a liquid motor fuel (such as gasoline) with a higher number indicating a smaller likelihood of knocking called also octane rating compare cetane number Example Sentences Recent Examples on the Web The higher the octane number, the more stable the fuel. Courtney Linder, Popular Mechanics, 22 Mar. 2022 Fueling requires unleaded pump octane number (PON) 86 or higher. Joe Michaud, San Diego Union-Tribune, 16 Aug. 2020 Word History First Known Use 1931, in the meaning defined above
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