Definition

A small valve or faucet that is used to release gas or drain liquid from a system, often found in plumbing or machinery.

Example

The mechanic opened the petcock to let out the excess pressure from the radiator.

Conversation

Have you checked the petcock on the boiler lately?

No, I haven't thought about it. Why?

It’s important to drain it occasionally to prevent pressure build-up.

Good to know! I'll make sure to check it this weekend.

Synonyms & Antonyms

Root Explanation

**Petcock** → The word 'petcock' is derived from the combination of 'pet' (from Middle English *pet*, meaning small or little) and 'cock' (from Old English *coc*, meaning valve or tap). A petcock is a small valve used for draining or controlling the flow of liquid.

Memory Tip

Think of a 'small' ('pet') 'valve' ('cock') that controls the flow of liquid — that's what a petcock does.

Visually Confused Words