Definition

A chemical added to fuel to prevent knocking in engines, which helps improve performance and efficiency.

Example

The mechanic recommended using an antiknock additive to enhance the car's engine performance.

Conversation

I heard that adding antiknock agents to fuel can improve engine performance.

Yeah, I think it helps prevent that annoying knocking sound.

Exactly! It makes a difference for older cars too, right?

Absolutely, especially if they were designed before the new fuel standards.

Synonyms & Antonyms

Root Explanation

Antiknock is formed from "anti-" (meaning against) and "knock" (from the verb to knock, which refers to a sudden impact or collision). The term describes a mechanism or additive that prevents knocking or pinging in an engine, thus working against the undesirable effect of knocking.

Memory Tip

Think of 'anti-' meaning against, and 'knock' referring to a sudden impact — so antiknock means something that works against knocking.

Visually Confused Words