Definition

Referring to a quantity of fissionable material that is not enough to start a nuclear chain reaction or is below a certain critical level.

Example

The experiment was conducted with subcritical amounts of uranium to ensure safety.

Conversation

I read that some nuclear reactors are designed to be subcritical for safety reasons.

That makes sense, it helps prevent any accidental chain reactions.

Exactly! It’s interesting how they manage the energy production.

Yeah, I guess keeping things subcritical is a smart way to ensure safety.

Synonyms & Antonyms

Root Explanation

Subcritical → It is formed from "sub-" (meaning under or below) and "critical" (from Greek "kritikos", meaning able to judge or discern). The word "subcritical" refers to a state that is below the critical threshold or point.

Memory Tip

Think of being 'under' ('sub-') a point where something can be judged or discerned ('critical'). This helps you remember that 'subcritical' means below the critical level.

Visually Confused Words