Is “Antiknock” a Scrabble word?
Yes
ANTIKNOCK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Antiknock
noun
1.Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)
adjective
1.Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.