(electronics) A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used.

A region of low atmospheric pressure, especially one in which most of the air has been pumped out.

simple past tense and past participle of vacuum-pack

Packed in an airtight container in a partial vacuum.

A desiccator fitted with a stopcock whereby it can be evacuated

plural of vacuum tube

A state of relative anarchy compared to neighboring states, often caused by death of the head of state before a successor could be designated.

(physics) The underlying background energy of empty space associated with constant vacuum fluctuations.

plural of vacuum cleaner

A piece of equipment used for extraction of gas or vapour from an enclosed space, leaving the container with a partial vacuum.