# subdomain

> English word · Noun · frequency rank #86,804

## Definitions
1. A domain or sphere that is part of a larger domain or sphere.
2. A domain name that has been prefaced with additional parts separated with periods.
3. An additional part prefaced to a domain name.

## Etymology
From sub- + domain.

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