trademark registered in Britain 1907, invented by Sir James Dewar (patented 1904 but not named then), from Gk. thermos "hot" (see thermal). Dewar built the first one in 1892, but it was first manufactured commercially in Germany in 1904, when two glass blowers formed Thermos
GmbH. Supposedly the company sponsored a contest to name the thing, and a Munich resident won with a submission of Thermos.