# planetary gear

> English word · Noun

## Definitions
1. A system of gears that has a central gear wheel (sun gear) around which others (planet gears) rotate, often within an outer ring.

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