# midfeather

> English word · Noun

## Definitions
1. A vertical water space in a firebox or combustion chamber within a steam boiler.
2. A support for the centre of a tunnel.

## Etymology
From mid- + feather.

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