Thermos: nm A thermos (trademark registered in 1907, word coming from the Greek meaning "hot"), is an insulating container with a double glass wall separated by a vacuum, which maintains the temperature of the liquid it contains for a few hours. , insulated bottles are sometimes called "thermos bottles" or simply "thermos".
Very fashionable in the grand hotels of the early 20th century, where people asked for their thermos to go for a picnic on the grass.
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