# planetary nebula nucleus

> English word · Noun

## Definitions
1. The remnant hot luminous core of the stellar progenitor of the planetary nebula, which ionizes the surrounding planetary nebula.

## Etymology
From planetary nebula + nucleus.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/planetary-nebula-nucleus