nuclear.

1. Relating to atomic nuclei or the energy released through changes in them.

2. Relating to a central core, including the nucleus of a cell.

3. Relating to a family unit consisting of parents and their children.

Use it for

Words that belong together

• nuclear reactor
• nuclear reaction

On the page

The nuclear reactor remained isolated from the habitat.

Usage notes

Primary category: sci-fi. Forms: Normally non-gradable; no ordinary comparative or superlative. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.