planetoid

noun

plan·​et·​oid ˈpla-nə-ˌtȯid 

: a small body resembling a planet

especially : asteroid

planetoidal

ˌpla-nə-ˈtȯi-dᵊl 

adjective

Examples of planetoid in a Sentence

Recent Examples on the Web

That distinction now goes to a planetoid nicknamed Farfarout (2018 AG37), which was found in 2021. — Jamie Carter, Forbes.com, 30 Apr. 2026

It's aptly named after LV-426, the infamous planetoid that the interstellar towing vessel USCSS Nostromo set down upon to discover the derelict spaceship and its insidious contents in the classic 1979 feature film. — Jeff Spry, Space.com, 27 Apr. 2026

But there was another very large, Mars-sized planetoid that was in an almost identical orbit to Earth’s. — Big Think, 26 Nov. 2025

In Galaxy 2, Mario can hop on his trusty dinosaur steed and leverage Yoshi's unique abilities while traversing the inventive planetoid stages. — Jeffrey L. Wilson, PC Magazine, 20 Sep. 2025

Word History

First Known Use

1803, in the meaning defined above

Rhymes for planetoid

• granitoid

Kids Definition

planetoid

noun

plan·​e·​toid

ˈplan-ə-ˌtȯid

1

: a body resembling a planet

2

: asteroid