Antiknock fluid is a type of fuel additive used to reduce engine knocking and improve the performance of gasoline engines. The crossword solutions for antiknock fluid are ETHYL (5 letters), ETHYLS (6 letters), OCTANE (6 letters), DRAM (4 letters), ACID (4 letters), and SERUM (5 letters). Ethyl is an alkyl group derived from ethane, and ethyls are compounds containing this group. Octane is an alkane hydrocarbon with eight carbon atoms, and is used as a measure of the performance of gasoline. DRAM stands for 'dynamic random access memory, ' which is a type of computer memory. ACID is a substance that releases hydrogen ions when dissolved in water, and SERUM is a clear liquid component of blood.