# castellum

> English word · Noun

## Definitions
1. A small Roman detached fort or fortlet used as a watch tower or signal station.

## Etymology
Learned borrowing from Latin castellum. Doublet of cashel, castell, castle, and château.

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