The Collaborative International Dictionary
Midfeather
Midfeather \Mid"feath`er\, n.
(Steam Boilers) A vertical water space in a fire box or combustion chamber.
(Mining) A support for the center of a tunnel.
Wiktionary
midfeather
n. 1 A vertical water space in a firebox or combustion chamber within a steam boiler. 2 (context mining English) A support for the centre of a tunnel.
Usage examples of "midfeather".
A telltale tickle at the edge of my mind pushed me back behind a towering midfeather which held up the groined ceiling.