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pro-knock
pro-knock adj. and n.
Brit. 
/(ˌ)prəʊˈnɒk/
, /(ˌ)prəʊˈnɒk/U.S. /ˌproʊˈnɑk/
(a) adj.tending to cause knocking when present in the fuel used in an internal combustion engine; (b) n.a substance having this property./ˌproʊˈnɑk/ΘΚΠ
society > occupation and work > materials > fuel > chemical fuel > [adjective] > properties or characteristics
premium1856
three-star1879
naphthous1885
paraffiny1902
propellant1919
pro-knock1927
high-octane1931
hi-octane1934
unleaded1934
monopropellant1949
nonleaded1955
super unleaded1978
the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > petroleum varieties > qualities of
pro-knock1927
smoke point1933
1927 Jrnl. Inst. Petroleum Technologists 13 301 Amyl nitrate and nitrite..according to Midgley are pro-knock.
1928 Jrnl. Inst. Petroleum Technologists 14 188 They might have some indications..as to how the pro-knock worked as against the anti-knock in that particular type of flame propagation.
1953 E. M. Goodyer Petroleum & Performance in Internal Combustion Engines viii. 189 Ignition accelerating materials are those which act as pro-knocks in spark-ignition engine fuels.
1991 Hydrocarbon Technol. (Nexis) Dec. 443 Other structural types have displayed a highly pro-knock behaviour, which makes them potential candidates as ignition improvers in automotive diesel oil.
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as lemmas