vacuum brake noun

A brake in the working of which suction by vacuum(s) supplements the pressure applied by the operator, esp a braking system of this type applied simultaneously throughout a train

vacˈūum-clean transitive verb and intransitive verb

vacuum cleaner noun

An apparatus for removing dust by suction

vacuum cleaning noun

vacuum concrete noun

Concrete enclosed in special shuttering which enables suction to be applied to remove excess water

vacuum flask noun

An insulated flask for keeping substances hot or cold by means of a vacuum lining

vacuum forming noun

A method or process of shaping thermoplastic by applying suction to it when warmed and placed over a mould

vacuum gauge noun

A gauge used to measure pressures lower than atmospheric pressure

vacˈuum-packed adjective

Sealed in a container from which most of the air has been removed

vacuum printing frame noun

A frame from which air can be exhausted to ensure close contact between the film image and plate

vacuum pump noun

A general term for apparatus which displaces gas against a pressure

vacuum tube noun

A sealed glass tube in which a vacuum has been made, eg a thermionic valve

ultra-high vacuum

A very close approach to complete vacuum, important for certain work of scientists and technologists