What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
(In a semi-diesel engine) an uncooled chamber connected to the cylinder head which is maintained at a sufficiently high temperature to vaporize fuel oil injected into it prior to compression in the cylinder; any mass of metal that performs the same function in such an engine; frequently attributive.
Early 20th century; earliest use found in U.S. Patents.