vacuum flask

Noun

 * 1)  A Dewar vessel, a scientific instrument used to store liquified gases.
 * 2)  A type of glass flask used in a laboratory similar to an Erlenmeyer flask, but with a side spout used for connection to an aspirator.
 * 1)  A type of glass flask used in a laboratory similar to an Erlenmeyer flask, but with a side spout used for connection to an aspirator.