Word: antiknock
Part of speech: Adjective
Syllables: an
ti
knock
Definition: Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.
Morphemes:
Affix: anti-
Language: en
PoS: Prefix
Meaning: Counteracting, neutralizing.
Affix: knock
Language: en
PoS: Noun
Meaning: Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it.