steam jacket
noun
a casing, as on the cylinder of a steam engine, filled with live steam to keep the interior hot.
Origin of steam jacket
First recorded in 1830–40
OTHER WORDS FROM steam jacket
steam-jack·et·ed, adjectiveWords nearby steam jacket
steam fog,
steam hammer,
steam heat,
steam heating,
steam iron,
steam jacket,
steam locomotive,
steam organ,
steam point,
steam reforming,
steam room
British Dictionary definitions for steam jacket
steam jacket
noun
engineering
a jacket containing steam that surrounds and heats a cylinder